Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff12d1dcaa3d5b0…

MALICIOUS

PDF

51.2 KB Created: 2020-08-08 19:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2775371ce8a64a8b015a38df0faaa27 SHA-1: 1e6453c158747f2d53b63d3c2879d6efa6ed7633 SHA-256: aff12d1dcaa3d5b0aa6a07452af66e4db01f4e0ea70656164a83e8791fa30a3d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=the%20secret%20garden%20children'. The document body also contains the same lure text, reinforcing the social engineering aspect. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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=the%20secret%20garden%20children
    • http://nadebiver.slykerfamilyministry.com/uploads/1/3/1/3/131380213/juberisal.pdf
    • http://files.killingfieldsterrain.com/uploads/1/3/1/4/131453253/momesuwav.pdf
    • http://files.raverstoriesproject.com/uploads/1/3/1/3/131380942/ca49b2f67b0b22.pdf
    • http://files.ironcountywatershedcoalition.org/uploads/1/3/0/7/130739742/0a2acb2d47.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/zatil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0839/files/refimezavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1982/8386/files/pagefunopefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/general_chemistry_atoms_first_mcmurry.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/63136003933.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/fl_studio_12_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/bavobevikuverojobaxofuxet.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/portal_knights_sea_sapphire.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/gypsy_witch_fortune_telling_playing_cards.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/zipobegavirewibisugis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0841/7192/files/mcdonalds_job_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gimuwuwizarisatin.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a6e.bin
0450a0f5a134616e5c14f7d828a585959e5b6a72d6ffafb95994eebcb512e99c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6E 4440 bytes
font_01_sfnt_off00008a30.bin
f4e2ff67ad0cc555fbc52abcb747d15b1c54ecebd47f57530cc1e6653fd71a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 5604 bytes
font_02_sfnt_off00009d37.bin
aa140ee09cceb9a5f85af473b229feff942b44cf3a325d3e6bc8e1ddee25d85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D37 10032 bytes

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