Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f71d3c046edfab2…

MALICIOUS

PDF

35.3 KB Created: 2020-08-15 01:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45979b63d6f61cbe113b1a30d5d8b821 SHA-1: 9c0401f5cb44337f027a44c058996e6f5b505174 SHA-256: 6f71d3c046edfab213bb8f16a4b2741a57c688fab4f12bd6d4cbe3f8b93ee5ce
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=letter+d+tracing+worksheets+for+preschoolers'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

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.cc/pify?keyword=letter+d+tracing+worksheets+for+preschoolers
    • http://xerazonen.persnicketyjane.com/uploads/1/3/0/7/130775734/komexaxipanavimaw.pdf
    • http://kimubafa.prestigelandscapesupply.com/uploads/1/3/1/4/131452903/begujimowosoguputog.pdf
    • http://files.eco-literate.com/uploads/1/3/2/7/132712306/8081490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/keguroxurejumikibifamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/93803275988.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/78360933511.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/29881376432.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/1st_person_2nd_person_3rd_person.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/books_of_the_bible_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/rodixo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/yaseen_shareef_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/wajoletalave.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/six_sigma_handbook.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_off00004afb.bin
568a3778a89c9e1698ffc34265c773ec1829f16fa776df4eaa208c3f4393a553
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFB 5516 bytes
font_01_sfnt_off00005dd2.bin
0345b6c208a1c4d4eedfcbf922042a83c29a839318b0ce58a67fb7e6d41cdd0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD2 10080 bytes