Malicious PDF — malware analysis report

Static analysis result for SHA-256 129e3054224d96ae…

MALICIOUS

PDF

36.0 KB Created: 2020-08-03 21:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fea532cd7a20d30a3ff515bfa90386 SHA-1: 77cb3c0a344127405b05d0b4ee888e34eb9619e9 SHA-256: 129e3054224d96aeee931205e594dbc9f967588d7efd5b567351bf4762c53646
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=inorganic+chemistry+notes+for+jee+advanced+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs and appears to be a lure for educational materials.

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=inorganic+chemistry+notes+for+jee+advanced+pdf
    • http://fivuvat.nicoleguimaraes.com/uploads/1/3/1/3/131379012/1085009.pdf
    • http://files.fusiliersheep.ca/uploads/1/3/1/4/131453990/sevarasekaz.pdf
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdf
    • http://files.kelvinwong.com/uploads/1/3/2/6/132695915/xevaseluxorewinu.pdf
    • http://files.korrieleer.com/uploads/1/3/1/4/131452733/2098447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/91490170955.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/40612268529.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/minecraft_set_time_day.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/rejadogojerojutokarapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/33707061740.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/auto_clicker_gary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/data_analysis_defined.pdf
    • https://cdn.shopify.com/s/files/1/0431/1118/6588/files/lejizugepe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/85525433529.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/hashset_time_complexity.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c76.bin
efa9f9f78148fcd651db451df4b34070617916ed1399ce771a5b66bf5a3351c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C76 5712 bytes
font_01_sfnt_off00005fce.bin
5251b43b2d19bcd414cf054d5f82c04380917abab472df02749850b0d6948b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCE 10228 bytes

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