Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71c72c543f7c1a8…

MALICIOUS

PDF

47.0 KB Created: 2020-08-30 16:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcceead73a2d97e2b6d8ad8bbded4e54 SHA-1: 5c9f3fe2cafb2e99caae9c3547a2b97f3e7cb090 SHA-256: c71c72c543f7c1a8b338a05e60f622dbb71fbfae7521c97a30b57e7da5261f7d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a formula for mechanical advantage. The document also contains a large number of links to Shopify-hosted PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact payload.

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=formula+for+mechanical+advantage
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/clear_entities_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/nuwisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/nusavubakisupumafomadexuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61051106257.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/dreamer_ro_guide_for_newbie.pdf
    • https://cdn.shopify.com/s/files/1/0440/1358/4542/files/befanotebupefowuvimupub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/56516139595.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/kazineduxevekeromojugi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/steam_transaction_history.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/bulawufes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6690/files/28265049940.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/34222865528.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/feboduferaxififunelewego.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_off000073db.bin
747a49a4abef3a25731e9672fa18ca4b0bc111038aaea5bd90914ba2eacdfa64
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DB 5272 bytes
font_01_sfnt_off000085b0.bin
d392f27e63c7609d597183a51ba8150948a07daa5b1773804c019901183d90b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B0 13104 bytes