Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef34d70c9e9bacf…

MALICIOUS

PDF

35.2 KB Created: 2020-08-08 05:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4960172d6f4d26656885430b175ab900 SHA-1: e27e2b866d9fc14d4e542df9a03789547103d326 SHA-256: 6ef34d70c9e9bacf71237bfdb6aef90b9991bc9b3b59bc8d0557fa3890698fa9
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious 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/wb?keyword=corpsman%20manual%20questions
    • http://dajege.jeteliteaviation.com/uploads/1/3/1/4/131409090/a7c3d062adfe131.pdf
    • http://files.foreverrockcandles.com/uploads/1/3/0/7/130776370/puzewo.pdf
    • http://files.snovalinc.com/uploads/1/3/1/3/131380889/7866632.pdf
    • http://ximememe.delcodiamondsfastpitch.com/uploads/1/3/0/7/130740025/f342b3.pdf
    • http://losipuxig.rsllcw.com/uploads/1/3/2/6/132682883/luriwizogage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/71068798030.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/majefategoxilemugo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/ns_session_id.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/vafurubikizetosuworobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/54915344431.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/13637212467.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/asthma_action_plan_texas.pdf
    • https://cdn.shopify.com/s/files/1/0429/7801/7443/files/bls_acls_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/xavater.pdf
    • https://cdn.shopify.com/s/files/1/0448/6601/1298/files/list_of_digestive_enzymes_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/xuteraxunajemewisuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/blank_budget_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/fawamojodido.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_off00004b61.bin
067e230b8591303d3d00454f7e6103e5c9a8b7a72177c0894abe6465fc805c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B61 4996 bytes
font_01_sfnt_off00005c40.bin
2cc81355996e592e45f220004844046ae83921aee362c6307b493e6db95918a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C40 10048 bytes

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