Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bf91c20e0274e3…

MALICIOUS

PDF

49.2 KB Created: 2020-07-26 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228cde0467b1b6eb31ec25840f73ec6b SHA-1: 6726ee8dab0ee136c1cf4af556b3065d778372c7 SHA-256: 18bf91c20e0274e32be7b9a2310682f23be8837ec063b4d0f698c66d6e2f4f0d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, disguised as an inquiry about a credit report. This suggests a phishing or scam attempt, potentially leveraging a callback lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links further supports malicious intent.

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.ru/pify?keyword=inquiries+on+credit+report+not+mine
    • http://files.sweetteasweettreats.com/uploads/1/3/1/4/131408245/3283174.pdf
    • http://files.dunsmuirdeerhounds.com/uploads/1/3/1/0/131070450/5819530.pdf
    • http://files.matthewhavertz.com/uploads/1/3/0/7/130776239/54d36c1b885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/94215034441.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/dobodol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/vexotazivukajudiku.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3789/files/62137799996.pdf
    • https://cdn.shopify.com/s/files/1/0434/2258/0886/files/14599307849.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/6789944451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/venuzejajokop.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/99004083328.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/fibebiviza.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/98911041556.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_off00008469.bin
6d110756d7e8bb3c404fffa33f42abf8b66cf1d6dfa9c45b9bd4e90c006864b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8469 4924 bytes
font_01_sfnt_off00009501.bin
95352a88ea5156f94c442923dd8efb2c1ec7e9e073bb1138009973193cd40196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9501 10188 bytes

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