Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b824eb862f43bfd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-13 23:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf6a0c480d16e3707647bcbd69db5e5d SHA-1: 14afc908d6af57d7993f45314d3c0aa24e54185c SHA-256: 6b824eb862f43bfd93afe0e375e75af1cf24dbb34b2f5bb8b22c614ea0776545
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly indicated maliciousness. The document body itself contains text and URLs that appear to be part of a lure, attempting to disguise the malicious intent.

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/wb?keyword=a%20walk%20around%20the%20snickelways%20of%20york%20pdf
    • http://tuzakibar.astuntech.com/uploads/1/3/1/0/131070374/kutopol-kilurev-mazupafotijovo-joketowami.pdf
    • http://files.enfieldrefugeewelcome.org/uploads/1/3/2/7/132740234/ad6b7ce8eb8d9.pdf
    • http://wutakif.turtleclan.com/uploads/1/3/2/7/132712615/kaforefaj.pdf
    • http://files.abigaildennistonphotography.com/uploads/1/3/1/3/131379689/dugonelozel.pdf
    • http://files.4x4unity.com/uploads/1/3/1/8/131856757/mopefegob_podaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/womisefiranotexote.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/30429102086.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/organic_chemistry_2nd_edition_david_klein.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/fonamukilode.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/al_akhbar_egypt.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/rizopowaxirogixekuworotel.pdf
    • https://cdn.shopify.com/s/files/1/0439/3461/3659/files/sutovukodiwukidid.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/duzimelidufadijak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/15133360807.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/90551599561.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/menagonumalipavopepob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24863128440.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_off00006138.bin
afa7cf7712c19ca9a4d4f8b96dc3e7afabbb3c1c3455cf14ca840ddb706ac75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6138 5492 bytes
font_01_sfnt_off000073f4.bin
2acb2317f11d2851333c30858896ce65ae1f4abeffc838a7deb1a6e2ce8dcc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 10000 bytes

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