Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71f88489d2a141…

MALICIOUS

PDF

46.4 KB Created: 2020-08-14 13:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b404f5df778de2edcd89077e420c1a5 SHA-1: 3776e2f800b6ffda0cd46c8a7257a1012401962c SHA-256: fd71f88489d2a141709091fa3d2d14ad65aea85a13e97b25b0d165e686c271f6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The document body itself contains the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy, likely to improve SEO for malicious content.

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=pdf%20editor%20arch%20linux
    • http://tumabar.ducksoupntreats808.com/uploads/1/3/1/8/131871390/12e5685b72.pdf
    • http://files.stringsforhope.com/uploads/1/3/1/6/131607230/57b4542b17.pdf
    • http://gisibodo.ebhawleyimages.com/uploads/1/3/1/0/131070450/fozogozuterobe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/lobamibefaxujuzotamaxit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/english_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/4207/7852/files/27396866428.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/kepijusorovipupew.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7672/files/84081239642.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/early_civilizations_ancient_egypt_in_context.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/542912088.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/catalogo_hinode_em_espanhol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/download_one_piece_ep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/90359682293.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/banoxufawupuwinomupodanug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a3.bin
56a9413307cb7ea1d0210354b254feebd9c3ec5f527081fd6f662f83f36cd23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 5000 bytes
font_01_sfnt_off0000899d.bin
7502d2a9b7551b336a9499d7d9ccb255cbbb0a34a2589572a313231698ca3803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899D 10252 bytes

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