Malicious PDF — malware analysis report

Static analysis result for SHA-256 163933d17c92a133…

MALICIOUS

PDF

66.0 KB Created: 2020-10-28 11:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c2e22eff6ed21c9123f86eb1d47cadb5 SHA-1: 36f2967538168aea669225b197089f353ac04e57 SHA-256: 163933d17c92a1336d6c535e68680a9cf42449e44f36b3ddc569c55d00070848
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector URL (ggtraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains references to VMware topics and the malicious URL, suggesting a lure for phishing. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=ovf+vs+ova+vmware In PDF document text
    • https://zitajajelenineb.weebly.com/uploads/1/3/4/5/134512459/1710539.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/wudawuwifigogebala.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/4706294.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/mejisasemexa_mexidixuxoguri_pomadito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6950/5187/files/pebitiruwaminiwinanexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/domurevufigazegakegovigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2263/1067/files/fallout_1_download_ita_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8377/4614/files/tu_sooraj_main_saanjh_piyaji_apne_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7174/0320/files/95609590417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2805/6728/files/pejaxonukemitufagi.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/96824135491.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/ancient_egypt_map_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/list_of_water_bottling_companies_in_ethiopia.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/solidworks_2017_tutorial_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/psc_exam_calendar_september_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bd4d99-6114-43c3-96de-e76fcd4ce4de/33646394011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b053a4c0-5121-49a1-a7aa-e57e50423ef9/toluwus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff366c2-4c17-488d-9447-093d1be1d9e5/28248365850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43699867-2bea-4a1f-8520-943a13a04bdb/saxomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2122/5114/files/rerofetovelivimixetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4105/7687/files/81936914432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/6712/6958/files/dekijubegumukopuzunifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/muldoon_jurassic_park_legs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000d8eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD8EB 20384 bytes
SHA-256: a9255d394697264861a006e4691a40f4216cfd22de7b7c8270f0c218019fa8bf
font_00_sfnt_off00007131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7131 15244 bytes
SHA-256: 6f64fdb88c63c997261d72ae17de11a42955eed4eb42766e5b63c81324ad3c8b
font_01_sfnt_off0000a34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA34C 5060 bytes
SHA-256: a558eb8ea46de74b182f7c3490f78bb860a2fe69798a672b76f2e5a074bc95f9
font_02_sfnt_off0000b47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47E 10656 bytes
SHA-256: 3d873157102f5701edca0ebd0e2af106d7052f786191b9b0410a0f98be5b716c