Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c8f1adbc241fd9…

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 00:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa1f0a45537b8f9c4e42c663a0e85cc SHA-1: 504e28c6ec5035c530f421f2e8c514c3daba3fad SHA-256: b9c8f1adbc241fd96e17344c613e5ddbe6ec2bff0c8e1875cb45b959ca6fec56
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.ru/wix?keyword=awdhesh+premi+ka+video+gana+2018, which is likely used to redirect users to further malicious content.

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/wix?keyword=awdhesh+premi+ka+video+gana+2018
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/nixajajela.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/dictionary_of_russian_slang_and_colloquial_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/26246163691.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/gititofezugapizoropaguwup.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/example_of_polysyndeton.pdf
    • https://static.usrfiles.com/ugd/b916f4_4012cc47028740aca13f6fdba5b6427d.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/56301759913.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/17393482584.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/sipowikixegobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/pifosukisuduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/15874164060.pdf
    • https://cdn.shopify.com/s/files/1/0439/9933/0462/files/xoxofubifilexufilux.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/68036785027.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_off000054f6.bin
f8350a0d223bce45442f47019072910325c6c01de8e7dd2b2cf295db30c05e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F6 6064 bytes
font_01_sfnt_off0000698a.bin
806187b6d563e0c59cfb8c71ba16e5630742caa1295ed5ad6f9fa24e80634e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 14876 bytes