Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045a572f920acc2…

MALICIOUS

PDF

63.3 KB Created: 2020-07-30 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a224c787e779dd6b30c2fadde923d19 SHA-1: fb68d59667c051d2be19c992eb1843f8ccef856a SHA-256: a045a572f920acc2326a094cd73f18891acc1881dfb727b8384e1bd30f4e0294
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary redirector URL being https://ttraff.cc/pify?keyword=official+cribbage+rules+pdf. The document body is heavily obfuscated, but the presence of numerous links hosted on Shopify and other domains suggests a link farm designed to distribute traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=official+cribbage+rules+pdf
    • http://files.johnvukusic.com/uploads/1/3/1/3/131380031/c3ab01de1d6896.pdf
    • http://files.shaunaleighwrites.com/uploads/1/3/1/0/131069887/losalabige.pdf
    • http://files.pesebry.com/uploads/1/3/0/8/130873855/3dbe5059d.pdf
    • http://files.barrettfineartadvisory.com/uploads/1/3/0/9/130969855/5337525.pdf
    • http://files.adaptivedrivingexperience.org/uploads/1/3/2/6/132681812/3370289.pdf
    • http://files.barrettfine
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/saxidifipis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/beweremuduzakaberul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/zonuregedaxin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8470/0055/files/bebomutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zodotuxufaliga.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/rojarebumekudepujus.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/77351358058.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/levato.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/sogutanowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/mawusonusad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/45129099098.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/90111922617.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61053474184.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_off0000b961.bin
831a5212b424460c9dea51c429d9f7d5846e80a0fae9cce05c067ec9280866b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 5076 bytes
font_01_sfnt_off0000caa6.bin
7ee0f8ad6e4333788c12cdfcdf2aca549b4a4929fb4dc0b510572a7d7476fcbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 11156 bytes

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