Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e57715898f4614…

MALICIOUS

PDF

45.1 KB Created: 2020-08-11 13:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5087bfb53cf290673820e66edcc1584e SHA-1: 020da97f5f9c06fc2c5822c9f03508a42c1880ab SHA-256: 77e57715898f4614a8a76fedd114fad177707e4916c0c0a1ada59b078822d549
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 pointing to external PDF files, which is indicative of a link farm used for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=tender+bidding+process+pdf'. The presence of advance-fee scam language further supports the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the scam lure strongly suggest a phishing or fraudulent scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=tender+bidding+process+pdf
    • http://files.centrodehistoria-flul.com/uploads/1/3/1/4/131453024/472695.pdf
    • http://files.bwamanila.com/uploads/1/3/2/6/132681210/zefojodepibusaseb.pdf
    • http://files.isshinryunj.com/uploads/1/3/1/4/131438111/rukume_kezopokine_pupekutikogoz_valasesugumupax.pdf
    • http://files.stephanieheger.com/uploads/1/3/0/8/130814687/bilemuvu-gipovik-befozorakono.pdf
    • http://files.havanarb.net/uploads/1/3/0/7/130740127/xomulijowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/73857388416.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/49465386121.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/equipment_in_microbiology_lab.pdf
    • https://cdn.shopify.com/s/files/1/0428/8865/9100/files/contenidos_factuales_conceptuales_procedimentales_y_actitudinales.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/2001_chevy_malibu_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0449/8276/3679/files/barbecue_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/uzbek_kino_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0033/files/71744938884.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/61051235413.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/guru_graha_mantra.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/58942634970.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/wefozowekizixifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/tokomexagesirawemibelawo.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_off00007357.bin
2f90524197ce5067a3ab3ee3381ca65cb72bb9e451268327d996d9b04425fb3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 5172 bytes
font_01_sfnt_off000084f3.bin
0c07c597feef939526abdcae239e119ecc2e0aca4a97b93bd74884d7f1d57da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F3 9948 bytes

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