Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c595be01b70a2ed…

MALICIOUS

PDF

44.2 KB Created: 2020-10-03 22:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 32fc3ddb32bb36b4fdf62ea8aef654b4 SHA-1: 639a7432692f89f36dfcd187f608e55e0bebd8aa SHA-256: 3c595be01b70a2ede6bcb75cb3c7347f1be9781043381b5c520bf6101f10fc72
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=4.4+biomes+workbook+answers In PDF document text
    • http://files.turosmathclass.com/uploads/1/3/2/8/132815118/85ba701b.pdfIn PDF document text
    • http://jeruni.firstlutheranpreschoolec.com/uploads/1/3/1/8/131856372/8006265.pdfIn PDF document text
    • http://gejuwoxe.saclegalprep.com/uploads/1/3/2/7/132712237/buridulof-nofusavuselazi-fetimowas.pdfIn PDF document text
    • http://files.hawaiiafterschoolalliance.org/uploads/1/3/1/6/131606343/2280863.pdfIn PDF document text
    • https://site-1037896.mozfiles.com/files/1037896/jujikigegaporogadukumosax.pdfIn PDF document text
    • https://site-1040082.mozfiles.com/files/1040082/21814222303.pdfIn PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/25942290736.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/devusudefagazotili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5743/8101/files/bogano_chests_bogdo_sinkholes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4540/5350/files/house_arryn_traits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3245/6615/files/xemajipufoxog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8644/1374/files/work_power_and_energy_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4252/5343/files/legelekaperazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/lily_van_der_woodsen_net_worth.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 4828 bytes
SHA-256: f568f117bfac1940aa0185aec290d5f733764143f443ed7238b1e9348e336a62
font_01_sfnt_off00007235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7235 10532 bytes
SHA-256: dbb42fdf298bd53aaf5116cc19c1d05326548615c6793c3dded2ea0616cc8f39
font_02_sfnt_off00009605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9605 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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