Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b13fa948da86482…

MALICIOUS

PDF

52.0 KB Created: 2020-07-30 15:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e463cf552eb0f7a409ef75025fad6ea SHA-1: 5483aa8db11f7cf86ad27ec205ee75f1b93221af SHA-256: 8b13fa948da86482b71831cbcf94ed43d7d09f7aa4f774814de2fa6a8ef08a19
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm with numerous links hosted on cdn.shopify.com, suggesting an attempt to distribute or obscure malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, but the presence of the malicious redirector and link farm strongly indicates a phishing or malware distribution attempt.

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.com/pify?keyword=alzheimer+fisiopatologia+pdf
    • http://files.direction4lifework.com/uploads/1/3/2/8/132814593/gakojon.pdf
    • http://files.beclaims.com/uploads/1/3/2/6/132681863/4729554.pdf
    • http://files.mindfulsomatictherapy.com/uploads/1/3/1/8/131872105/puvuwoxi.pdf
    • http://files.healthyhap-peanutrition.com/uploads/1/3/1/4/131453494/sinebifujo_wewataz.pdf
    • http://files.healthyhap-peanutrition.com/uploads/1/3/1/4/131453494/sinebifuj
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/nejojowojavemuliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/kokalum.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/87827744899.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/23439955665.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/99181184223.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/62824481358.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/mebujurotizurilinoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/wizafinebepowitejikagejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/zuroziwedunajuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/78119995933.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/13266926774.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_off00008cfb.bin
69019bd803800f98763e3122cf55e248e0a8950be84d611c71a208fc6f2af553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFB 5176 bytes
font_01_sfnt_off00009e9e.bin
5b67dc203a716712d11f23511e762f371df66f5758ba01f1f45eabf3f43cecd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9E 10712 bytes

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