Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbca03632d10ec6…

MALICIOUS

PDF

60.3 KB Created: 2020-08-10 11:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3ae94e757ab52297904e8d06bf3f4a SHA-1: a5a7883ef09ce5ea31982576a90090ce2468151f SHA-256: bfbca03632d10ec609016571ad0da470a8bd7b1bb0d1cb2fb6e51e284fdd3782
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a malicious redirector link pointing to 'ttraff.ru', suggesting a phishing or scam attempt. Another critical heuristic indicated a PDF link farm, with many links hosted on Shopify, likely to obscure the malicious intent. The document body, though heavily obfuscated, also contains the 'ttraff.ru' URL, reinforcing its role in a malicious redirection scheme.

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.ru/pify?keyword=importance+of+crop+rotation+pdf
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdf
    • http://files.woodlandwriters.com/uploads/1/3/1/3/131379223/99c3b52ab67d7c.pdf
    • http://files.faithintersections.com/uploads/1/3/1/8/131871621/b09415b76.pdf
    • http://files.johndinglerart.com/uploads/1/3/1/0/131071067/figuzuwa.pdf
    • http://fisag.dublinspecialolympics.net/uploads/1/3/1/0/131070152/fbd8ed9f14a4.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/vojakilonutubufoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/p90_x_fitness_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/37823760479.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/58567495880.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/kebubakosos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/21800723477.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/the_book_thief_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/lemomekudorevevikub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/64299052585.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mipubafuminidumef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/leg_strengthening_exercises_for_seniors.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3952/files/prime_factors_of_13195.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/52403140320.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_off0000afce.bin
1b3898ea1b870d1c490394c23ca8210a8d140a9a0ff336483567d01a6d3ba631		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 5028 bytes
font_01_sfnt_off0000c0ce.bin
4f0d0bf3b4f9c3d5db43073c6df1059e56e5a5c355e45fe876b8ef2520b9e713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 10336 bytes

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