Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80ac6c350ecdd93…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 02:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bdc52e2fad84958d0ceb48f37488da SHA-1: 8c8c98b189225c1e91e054f4e51d0ccf1e9de98e SHA-256: b80ac6c350ecdd934491c040ad4d8bd679e5743f67daf1c6b0000a8057983d47
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as interview questions, which redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, limiting the analysis of further stages.

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=questions+for+an+interview+pdf
    • https://static.usrfiles.com/ugd/538d67_0e737bcc8011434f800fbecd2cab88ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c2ee0dedd6a448a91324ba382142939.pdf
    • https://static.usrfiles.com/ugd/b56239_6bc3655f269e47c7a571e91541d58d82.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_0ea1c569997742169e0d73e7120a89ec.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/celebrity_crossword_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0459/9034/6909/files/kalakalappu_comedy_template.pdf
    • https://static.usrfiles.com/ugd/6cf392_824a00b0d5e4450296d79c2285237a7e.pdf
    • https://static.usrfiles.com/ugd/b11f6d_1c90727d1f154223afad5fc36665a729.pdf
    • https://static.usrfiles.com/ugd/b8c837_c575e52dff6f467181dd5c68f6159dc2.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/49697213680.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/buckling_of_columns_solved_examples.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_off000063f2.bin
8d6f065d6c41f7c2f71db655b84d0c80d3161cdb27c9fcce853388951815b9ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F2 5216 bytes
font_01_sfnt_off000075d8.bin
05386a6657a93edacddf7b90258776db6a79eebc0865b1a9a9f554abe4e19403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D8 10404 bytes

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