Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c023f3fc4d67000…

MALICIOUS

PDF

64.2 KB Created: 2020-07-30 15:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a92bbb2520f960e9c909ba3937a14f2 SHA-1: ca0d0cca0fffdd12420d8426dcb38e78ce039fc3 SHA-256: 1c023f3fc4d67000d3cc6d8ea85a33d9b0e6fcb8d6ca3eb4b2cb1587db53a407
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though largely unreadable, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create SEO-optimized content. The primary malicious indicator is the link to 'ttraff.com', which is flagged as a malicious redirector, likely serving as a lure to a phishing or malware distribution site.

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=array+in+c+programming+example+pdf
    • http://files.bristolgeogsoc.com/uploads/1/3/1/4/131438583/vugawitunasofo_difijomevunogal_bevotu.pdf
    • http://files.jmsupplyga.com/uploads/1/3/2/8/132814990/5962788.pdf
    • http://files.independantplastics.com/uploads/1/3/1/8/131871602/nosefafupamipigovu.pdf
    • http://files.hagiazo.net/uploads/1/3/1/8/131856129/43335cb3b12.pdf
    • http://files.londoneventplanthire.co.uk/uploads/1/3/1/6/131607163/761b786ed6053d1.pdf
    • http://files.hagiazo.net/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/modatotubuxemewite.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/99225542313.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/fulij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/momuduvufiwigasuwolazowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/4085019539.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/31044058526.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/12248642688.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/92826302750.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/86919847135.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/bubujaduzivoxagoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/fafivadaziresejetut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/tojajaperapaz.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_off0000b1b6.bin
ae516a0da253d0ef3f75de1fe06efe1fcfbcd6cf4f64fb8d5972d69ea1e63087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 5164 bytes
font_01_sfnt_off0000c324.bin
41d620bfebde7e3a03ef11c001ffecc8ac04e4c5852851c9e1581f5395b23017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 15504 bytes

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