Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e9c2c3095e8c1b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-28 17:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dbfdddd5c1c2694bf4c5dc160e6c63b SHA-1: cfe5d9b9f4f9265176eb565c962af22c0be4d137 SHA-256: 03e9c2c3095e8c1b21b10f30c9d7a35b3b61255e82a881788688f568c3bfd7c3
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 Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL found in the heuristics.

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.com/pify?keyword=kar%25C4%25B1%25C5%259F%25C4%25B1mlar%25C4%25B1+ay%25C4%25B1rma+y%25C3%25B6ntemleri+%25C3%25A7%25C4%25B1km%25C4%25B1%25C5%259F+sorular
    • http://zunagu.happypianolessons.com/uploads/1/3/0/8/130874431/52aab9b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/pufunoragu.pdf
    • https://cdn.shopify.com/s/files/1/0450/7703/7219/files/cashflow_game_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/stranglethorn_fever_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/12198497355.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/21017245133.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/demideporitola.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/nanakugiwem.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/digolevebuletigaxal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/chemistry_test_tube_powerpoint_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/memenijitupomow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/gifezuzufizasalasidatini.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/midaxigirizakeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/66990542260.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/73752691931.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a50.bin
63ec960ec241fa6da72f4aefd41cf9f4b777c7c8bb72a8afe9b44fd8d7b1b235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A50 5564 bytes
font_01_sfnt_off00005c42.bin
58f8be95a7896e9447076ff7e2498c75b41260f0b7a7991444c06fbcbc9aae2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C42 12176 bytes
font_02_sfnt_off00008262.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8262 16092 bytes

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