Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cbe921f696afa3…

MALICIOUS

PDF

48.1 KB Created: 2020-10-05 22:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e04a135a8448ed7be1c2894f799fb99 SHA-1: 705a4c84563f7a233aff93c37857457669daf297 SHA-256: 87cbe921f696afa3e11f47f4b991c83ebdcd7755146b6914c6e1dd0c2adb4ef6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of these links, https://gettraff.ru/pify?keyword=what+a+time+lyrics+julia, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/pify?keyword=what+a+time+lyrics+julia In PDF document text
    • http://nosite.befriends.org.uk/uploads/1/3/1/3/131383283/nuzujisazulu-xekep.pdfIn PDF document text
    • http://sexivuxix.southshorecruisingclub.com/uploads/1/3/1/4/131408970/8134891.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/1/0437/3368/0282/files/witcher_3_poster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/destiny_2_horned_wreath_essence_of_vanity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8335/6565/files/besamiminokewovuwok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/7_for_all_mankind_mens_jeans_slimmy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/30574232905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0386/3459/files/rawlins_county_ks_covid_19.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8069/1101/files/paseveranizotusipogefox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/wpa_wps_tester_premium_apk_download_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1844/7771/files/4924892276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3881/8713/files/thrive_the_third_metric_to_success_arianna_huffington.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/9552/3227/files/water_distribution_on_earth_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 5228 bytes
SHA-256: 905465cb154ea0501d90efd7c4ac9a414208bbeb1cbdf7a8e8bd598fc31f2a24
font_01_sfnt_off00008f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7B 10656 bytes
SHA-256: 9818a7ea3a803456fc700db9e677b0a2a8d5cce74dbab8ca0e0275bae8478846

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