Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ae70ac058a137…

MALICIOUS

PDF

46.8 KB Created: 2020-08-14 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281096b99ae38a8bfd8c3f1dc6ee45d4 SHA-1: a08cf5f285fd98b1e7483910e83204d51d178558 SHA-256: 7f3ae70ac058a13763a6fc908398d5b309a2572855fff2154062aa3f76b9d464
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm and a lure suggesting the user install a browser extension or update, which is a common social-engineering tactic. The embedded URL https://ttraff.ru/pify?keyword=chrome++settings+auto+open is identified as a malicious redirector, likely serving as the initial step in a multi-stage attack. The ML classifier also strongly indicated maliciousness.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=chrome++settings+auto+open
    • http://files.essaysandfictions.com/uploads/1/3/1/4/131437172/bdeb7d.pdf
    • http://files.everythingisnecessary.com/uploads/1/3/1/4/131437949/3553055.pdf
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/carol_dweck_mindset.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/reweni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/manual_acgih_em_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/masazometatodonesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/bhagavad_gita_file_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/4254562889.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/monografia_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/celiac_disease_review.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/animal_tissue_culture_books.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_off000079d2.bin
946762319d3621023a2301e8ee390ce65ccbd5e576aaad478ce8c64bb8f3bdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 5108 bytes
font_01_sfnt_off00008b0e.bin
50023aa44ef8d1d7daa8d07549b0fc929f709d7ed41f82da704d185ba293a5f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 10436 bytes

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