Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2360b1e465cc0e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 18:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c08351c301f9bb7dffac36487937ef8 SHA-1: 55ab17c77b0360a456170dbdf810a0c737251277 SHA-256: cb2360b1e465cc0edbd83c8f007330ba51c6eb8163447e3fabe986fbda0bb7a2
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting an SEO manipulation or link farm tactic. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL and numerous other Shopify-hosted PDF links, reinforcing the link farm hypothesis. No scripts were extracted, limiting the analysis of direct payload delivery.

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.ru/pify?keyword=sublime+shortcut+to+format+code
    • http://files.kindradouglas.com/uploads/1/3/1/4/131454270/407060.pdf
    • http://sugun.boatworksofalaska.com/uploads/1/3/0/8/130814124/7240f45.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/lemonumabadumujekuvupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/types_of_non_governmental_organizations.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/gumakekabosazizosedakuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1556/0616/files/taxupexifowituguri.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/gakajijapenaxomodamawavep.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/povesuronafelokip.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5415/files/lezafufizuvofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mokotutirajozejimus.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/gelavijapomabido.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/rovamavi.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_off00006a2f.bin
412c1830be9101bf60167ec27fceb11068b06bfc361f47d9c87a60841eef27e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2F 5504 bytes
font_01_sfnt_off00007cb5.bin
792d750a6ab6cc77c171890118f8339a1cfec9ba93ea9ec3adb223a05f826309
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB5 10204 bytes