Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c27d2725b94ce8…

MALICIOUS

PDF

127.8 KB Created: 2020-08-02 11:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dca7bb29d63cbc695f45f763e0d6d79 SHA-1: 7328a75d8ea0d9670e7e79166f37ff15d86e875a SHA-256: 72c27d2725b94ce8c35fbc571bdbabba3307a3dfa8abfe10c7349f4a7e4da57f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector, specifically `https://ttraff.cc/pify?keyword=final+fantasy+pdf`. It also exhibits a PDF SEO link farm behavior, with 28 external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the string 'Final fantasy pdf' and the URL, suggesting a lure to disguise malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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=final+fantasy+pdf
    • http://files.alohavolleyball.com/uploads/1/3/0/8/130874359/mujezolowetodu.pdf
    • http://files.lumcky.org/uploads/1/3/0/7/130774993/5852225.pdf
    • http://files.carolsullivanperkins.com/uploads/1/3/1/0/131071252/zusafilepege_katimoxugepiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9845/5705/files/walkmaker_european_block_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/respiratory_system_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/20701808330.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/45101039452.pdf
    • https://cdn.shopify.com/s/files/1/0435/4739/4199/files/physics_laboratory_manual_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1173/4686/files/varidedulaxaluvum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90675932679.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/jokab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/72219087553.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/gabudeguvadivadij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/tapukojabiv.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ebf.bin
e213db674f797efc260e80f9f9f7a6de59cfce2a44dc955bd41e35e44831ca49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 35268 bytes
font_01_sfnt_off0001bc5c.bin
4cae1f5d1b81a2b0c6aaec2d1e884a73a2923573a314f0d3623ddd41a446273a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC5C 4996 bytes
font_02_sfnt_off0001cd80.bin
588e01d450013bf9921ace4d9ed7e4623013d2102c1f52815a32b1f16ae87817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD80 10636 bytes

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