Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d01efd47c3a6e4…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b87a052c75df97d80c6c92b0dc1513 SHA-1: 7762a09c12dd09946b581bc841d73c0e5963681d SHA-256: 14d01efd47c3a6e478b77311a4375b9dd4262e06695ab0bc5fa851302d135403
174 Risk Score

Malware Insights

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

The PDF document contains a lure for an "Amex priority pass enrollment form" which, upon inspection, links to a known malicious redirector. The document also hosts a large number of external PDF links, many of which point to benign Shopify domains, but the primary redirector is highly suspicious. The ML classifier strongly indicated maliciousness, and the callback lure heuristic suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=amex+priority+pass+enrollment+form
    • http://jenob.meshtheatre.com/uploads/1/3/0/7/130740414/3435492.pdf
    • http://files.76bulbs.com/uploads/1/3/1/3/131382078/jusolapotikage_tovenuzo_gamexo.pdf
    • http://tobuf.ewoptx.org/uploads/1/3/1/3/131398367/74cbd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/97019786577.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/55318492177.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6755/files/bibamobatuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/zumigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5657/7182/files/sesogesamof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/dictionary_of_aerospace_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/52376722891.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/bisod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/jafefefuwomodirevi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/jufowofofibudovavumope.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/31074663091.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_off00005c48.bin
8f09662e3e0d20007ec9541209e262a21bccc4e490622ce61065972acf16f2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C48 5204 bytes
font_01_sfnt_off00006df1.bin
34bed0774afcb5ab0e70e388f8fea6d11c1d52b700c3955c03259766418ddbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 10224 bytes

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