Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4b476331667e61…

MALICIOUS

PDF

47.5 KB Created: 2020-09-01 02:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15169109f206ddaecb260f5c115d7017 SHA-1: bb2f05c03d900f85c56b30daa49ed81e9dc735d8 SHA-256: 7a4b476331667e61229129fe3b14df3b2268262bb24b921bacd69519e6baa3b3
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links, likely part of a SEO spam campaign. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=marginal+costing+example+problems+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9478/5704/files/biwi_ke_huqooq_shohar_par_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/guide_bijoutier_dofus_touch.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/7246100896.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/nesabowobasaxazizes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/amrita_pritam_poems_in_punjabi.pdf
    • https://static.usrfiles.com/ugd/d54300_701fc5605b9f42fb859bc02ec1b304ce.pdf
    • https://static.usrfiles.com/ugd/15cd4d_17cf253fa92c4abf973af8d77fc93faf.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/cypher_system_rulebook_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/73029355487.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_off00007b14.bin
e41546ca2fd09ae533b1cea60e4c203fa04365b72a1c145d75d3871c028621a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 5688 bytes
font_01_sfnt_off00008e62.bin
754e5f60ac4156c8a19296b79304ff89eb5d8fb48e24a8d3dfdbbd922194e699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 10164 bytes

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