Malicious PDF — malware analysis report

Static analysis result for SHA-256 a258963f637cea75…

MALICIOUS

PDF

53.1 KB Created: 2020-09-12 15:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb96e10a6c106015c2f38f482b8a8561 SHA-1: 67f5200442497c393c7e288eb4900308f78d6c72 SHA-256: a258963f637cea75e9f9a33112acb1ce529e7b10fa18391bd46bbebd1aa22ca0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.club/wix?keyword=cheat+engine+pubg+mobile+android In PDF document text
    • http://files.realwomenrealjewelry.com/uploads/1/3/1/3/131381544/lotozana_vetezovavokes_ruzuwefedexixol.pdfIn PDF document text
    • http://vaxuku.setmanage.org/uploads/1/3/1/8/131872096/kaxafad_muzugofotoj_kolamiroki.pdfIn PDF document text
    • http://files.concretegarage.com/uploads/1/3/2/3/132303045/kijanagifokudoposa.pdfIn PDF document text
    • http://files.armadilloescaperoom.com/uploads/1/3/1/3/131384136/8059520.pdfIn PDF document text
    • http://loduv.westsoundsportswear.com/uploads/1/3/0/8/130814011/8d6b0966a8.pdfIn PDF document text
    • http://files.stingrayentertainment.net/uploads/1/3/0/8/130874175/8afaba429.pdfIn PDF document text
    • http://files.rosamiliafornjea.org/uploads/1/3/1/6/131606069/6854889.pdfIn PDF document text
    • http://files.shopleatherarchives.com/uploads/1/3/2/6/132682892/rigejatixexololi.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
    • http://files.membership.editmysite.com/uploads/1/3/1/4/131437532/14a2d67b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/89740606341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/mems_capacitive_accelerometer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/2548852743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/husqvarna_chainsaw_bar_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0439/4661/files/nipetitesana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/98921830599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/business_proposal_for_website_development.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6160 5240 bytes
SHA-256: e661a1ad0e66bb150e364a98b8401269a00703f4a46058cb5bfbc074f75b0231
font_01_sfnt_off000072f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F3 14632 bytes
SHA-256: 38455ba9afef6e2c2148a683ef454af1bb6689d7f483b2719cfc17bd6c3ec24c
font_02_sfnt_off0000a03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA03F 16592 bytes
SHA-256: 4a765237e3533d1c398164f8a9fc335ef72dbe270494329c33482909cff64d68
font_03_sfnt_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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