Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a507c03355735…

MALICIOUS

PDF

73.7 KB Created: 2020-08-15 03:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48d6d1eef03abcc5a396b7d8f7f6f98f SHA-1: 3df6fc438405d2ef1b524ba8b52f5cb82abf2e04 SHA-256: 662a507c03355735f020bf2b3bdd330464746fcefaf7cc69d4b2efaab883e14b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to the 'International bebras informatics contest 2018' and a URL that appears to be part of a link farm designed to distribute other PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to harmful sites.

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=international+bebras+informatics+contest+2018
    • http://files.atouchofcolorbytamilee.com/uploads/1/3/1/0/131069875/punododiduxujori.pdf
    • http://repufono.happycakesgreenville.com/uploads/1/3/1/3/131383329/dbb43989f6.pdf
    • http://files.hannipianist.com/uploads/1/3/1/4/131452950/6024341.pdf
    • http://gitozofev.plant-miner.com/uploads/1/3/0/8/130874038/9009649.pdf
    • http://birow.artistmichaelbond.com/uploads/1/3/1/3/131380126/xesenegemogajuk-gikivetupo-senodexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/python_dictionary_to_csv.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/passive_causative_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/dajugewawarefobatolepores.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/15._3_applications_of_genetic_engineering_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/lowes_petoskey_mi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/long_tractors_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/bijigevidoxalofedumasane.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/gidod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/27024130692.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/66152749239.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/kupomizebufozase.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_off0000d0c7.bin
f8af4e48f74ca66471c7894ff135d0e22703d37a8adf6c6da9c9520b7039fe6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 4172 bytes
font_01_sfnt_off0000df99.bin
5becb3870e96788432f32eeb5010559e720bef5a4aa28a7dcf64453f1a65c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5624 bytes
font_02_sfnt_off0000f29d.bin
ca29b1b69850d09991d1026f13706397a4eed19fcf1470c8df8c3ce593d39239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 11528 bytes

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