Malicious PDF — malware analysis report

Static analysis result for SHA-256 157ec31b116806dd…

MALICIOUS

PDF

43.4 KB Created: 2020-07-30 19:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7400441cbb03b383795c5b7a06bee53f SHA-1: 927794ed258d27e32f522b9a2d75a80e0b6c3b31 SHA-256: 157ec31b116806ddf0403f39464a130621bbfcd675c9ac8169531e93c8b074a8
190 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as an affidavit form. It also features a large number of external links, many pointing to Shopify, suggesting a link farm for SEO manipulation or payload distribution. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a lure for downloading content supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=affidavit+form+pdf+zambia
    • http://files.dengkechen.com/uploads/1/3/1/3/131398333/bbdb410353.pdf
    • http://files.thewhoresofyore.com/uploads/1/3/1/6/131636827/joxiduniguduraz-jazokemim-vawuzenux-dunaw.pdf
    • http://files.edgemodernfurnituredesign.com/uploads/1/3/0/7/130775111/1749599.pdf
    • http://files.vfemporia.org/uploads/1/3/2/3/132303406/roduguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/49040476577.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/ribuxilasonovoxikibonasun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/dofojujosok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/pidowupofaporolikopesiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/73029487294.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/10508502506.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/68621542159.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/galugigizozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/65628011859.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/92663935893.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/73197501614.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_off00006c6b.bin
3c7a179587c16d6ed4c0e2cb148ee859221bb7a2f4f825b810063833dce0bd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6B 4780 bytes
font_01_sfnt_off00007ca9.bin
6123bbbe5a09f17b42fc69641bc305b45f7e6108f41fc2e6064c9697f8fc1460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 10516 bytes

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