Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c84e0b33153bee…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 19:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a090bda7cc7ca94f0a357d2fc0167160 SHA-1: 8336231918b0a1b34967b8cd6c04fb309b8af78a SHA-256: 78c84e0b33153beee977dcf3040ec6bde458cd5b1ef3a2ba0d40ce0778d63031
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/pify?keyword=ielts+listening+test+2+book+9+answers`. The document body also contains this URL, suggesting a lure to trick users into clicking it. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=ielts+listening+test+2+book+9+answers
    • http://natomapo.chicagoforklift.com/uploads/1/3/0/8/130815009/198097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/brche_krzen_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/cyanogen_13_nexus_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/mulojorezilakufuziluxopi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/cantilever_bridge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/1122970508.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/32070451740.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/86473659439.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/7744924557.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/26953109336.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_off00008e8d.bin
e0dcce257ca736079279a073b003a3c4b4d4118b88aef74fa36b32682da3cb2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 5376 bytes
font_01_sfnt_off0000a0ee.bin
ef28a9deee7abc0ad421fc3952478550f4cf187ee2f1d64f111c3c5c79798950
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0EE 10536 bytes