Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d750d5c2ca26e8…

MALICIOUS

PDF

35.0 KB Created: 2020-08-02 20:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca395958f101864a744236865bf6aa13 SHA-1: 606c6150d5898fe7d20f714da6bc2ab6c76076f7 SHA-256: 64d750d5c2ca26e8eb3c91a9974d85afb4aed3d436eb69c3a38004dd06941c28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic further supports this by identifying a large number of external PDF links. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document is part of a campaign to redirect users to malicious sites, likely for phishing or scam purposes.

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.com/pify?keyword=da+form+2+1
    • http://files.davidwallacerealty.com/uploads/1/3/0/9/130969357/nenosewop.pdf
    • http://files.ordiamond.com/uploads/1/3/0/8/130813787/306c49b9f5.pdf
    • http://files.mickeytheis.com/uploads/1/3/0/8/130813818/809dd1fb5.pdf
    • http://files.100youthwhocarecentralyorkregion.com/uploads/1/3/1/4/131438437/7d801585752be.pdf
    • http://files.sw-publishing.co.uk/uploads/1/3/1/3/131383727/a0ae89534dced5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/19198406897.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/7194462196.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/89145841888.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/likozeritalejafuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/rikarekijeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/luvekabemexaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7429/files/zejan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/how_to_hack_freebitco._in.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/9920790697.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/network_programmability_and_automation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/22085831650.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_off00004c46.bin
3abfd0f8f18c1fcc63f452b7fe24c176c4fc3a60a00e04712bcb28da5ab6d621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C46 4888 bytes
font_01_sfnt_off00005ce0.bin
fc72f4267412a806fda898afdf1a13cd9d18975c5695ee5db2edac6e7317b365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE0 10180 bytes

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