Malicious PDF — malware analysis report

Static analysis result for SHA-256 102494e3874d1792…

MALICIOUS

PDF

42.8 KB Created: 2020-08-11 21:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59457bff268cea7b6c037285fa99dd6d SHA-1: fff1d542aabf70bbb612cbccb2534ebc0c360700 SHA-256: 102494e3874d179264c54debd8579c61e3bb0aea9cd5904031267bc538ebc6b1
154 Risk Score

Malware Insights

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

The PDF document contains a link to a redirector infrastructure, identified as malicious. The document body also contains numerous links to PDF files, suggesting a link farm or SEO manipulation tactic. The primary malicious URL is https://ttraff.ru/pify?keyword=couper+des+pdf+gratuit, which likely serves as a lure to download further malicious content.

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://ttraff.ru/pify?keyword=couper+des+pdf+gratuit
    • http://files.undertheirrelevance.com/uploads/1/3/1/4/131438843/dijafesig.pdf
    • http://files.zeldaandbramble.com/uploads/1/3/1/4/131437862/c8f65e25cc.pdf
    • http://files.bridgetobridge.org/uploads/1/3/1/3/131398338/9039819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/desuminafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/fimorapowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/berkshire_hathaway_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/sobrecrecimiento_bacteriano_intestinal.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/55284702183.pdf
    • https://cdn.shopify.com/s/files/1/0429/2024/7462/files/lubowugozuje.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/wintrobe_s_clinical_hematology_13th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/vertigo_exercises_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/tokenikujuror.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/person_centred_therapy_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/xuxewarivupa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006690.bin
8daa33ba4898313d116399f3828837a3d5e1e03f2d6ed94952a550d6720ae27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 5084 bytes
font_01_sfnt_off000077ed.bin
790e1a96f172b7f68a286addf53297d4861624a0ea0fa7b47bf25a2aa781d403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 11880 bytes

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