Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbf3fcfaa0441ed…

MALICIOUS

PDF

32.5 KB Created: 2020-09-03 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d12b4caad6932247db471a8658a1985 SHA-1: bdeca743db6738a31ee017a51e87a7410a421953 SHA-256: abbf3fcfaa0441ed25279b1766a1ac6a69c8142db357ff6592fec380fc3b41c9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.club/wix?keyword=tamil+kaalai+vanakkam+pictures`. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the same malicious URL, suggesting the primary purpose is to redirect the user to a malicious site, likely for phishing or malware 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.club/wix?keyword=tamil+kaalai+vanakkam+pictures
    • https://static.usrfiles.com/ugd/fb83f1_82b7d7df6c4844b698381f91cb9dd5ad.pdf
    • https://static.usrfiles.com/ugd/05900a_af11713a93ec4d7a9880715ed1bbb1b8.pdf
    • https://static.usrfiles.com/ugd/628a76_af14b784d69a411ca11994f93ff12e30.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/science_comprehension_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/csgo_no_recoil_command.pdf
    • https://cdn.shopify.com/s/files/1/0434/1914/0253/files/nunitifebolufukes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/how_to_crack_sternum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/balancing_chemical_equations_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7255/files/medicinal_chemistry_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/vaxusojanolegux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/34950705988.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/speaking_english_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/sobevovuxogakitikozu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/96216661062.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/figebipiwixuta.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_off0000443f.bin
bf250b3e7c6c8dbd8faa1c20329722fd69e0b09237d7ced7ce81ecab1d42c7af
pdf-font-stream PDF embedded font (sfnt) at offset 0x443F 5152 bytes
font_01_sfnt_off000055b2.bin
603214d4bce6240973f2719653cfe92b2707038da84b38e55f0d3b82dfb8a9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x55B2 9236 bytes