Malicious PDF — malware analysis report

Static analysis result for SHA-256 257b0d5d888139a2…

MALICIOUS

PDF

44.8 KB Created: 2020-09-04 11:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9294c5d1c94af60982f9a39ad3b7a2 SHA-1: 3de49f558cf7474de7a5a05da8a7d783226f9153 SHA-256: 257b0d5d888139a2ef7efb27b685796fb4575a752621a7abf5f4ba2c3dd6c53d
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 malicious redirector links and a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body contains a URL that appears to be related to the link farm, and the ML classifier strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.link/wix?keyword=top+10+paid+android+apps+2018.

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.link/wix?keyword=top+10+paid+android+apps+2018
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/magisk_root_android_9_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/jiwaxevilot.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/fuketusegesevufuzar.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/cadette_eating_for_you_badge_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/97798627002.pdf
    • https://cdn.shopify.com/s/files/1/0434/9788/1766/files/question_answers_of_history_class_9th.pdf
    • https://static.usrfiles.com/ugd/2c8d66_9b1bd6c4722d4ad7a4c0ea268bb98548.pdf
    • https://static.usrfiles.com/ugd/b4609a_f602295e66654dc3bb982dd83c79cf2b.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9240/files/diploma_frames_michaels.pdf
    • https://cdn.shopify.com/s/files/1/0440/5710/0453/files/killeen_texas_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/1331/5480/files/mivudaxixana.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/25610438303.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_off00007169.bin
a6bed15608d847fcb774a7d45710a855469b048388244ee7c7b44b99f36fcbeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7169 5388 bytes
font_01_sfnt_off000083cc.bin
dc6d295671c93e74f644b22cb2a9fb34b2b410e543ebd119f61831b06bade747
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CC 10312 bytes