Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f394c9f4304b117…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 05:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b0a8d9c041d45ad1c70707f6f1183af SHA-1: 9c947624ea9ae45de7e68e7f8d146a7b54cf076e SHA-256: 7f394c9f4304b11720ee4e97bf475958a31a289912cae6b571b70ee5702e6169
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and a series of benign-looking Shopify URLs, likely part of a link farm to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=young+dolph+role+model+zip
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/mtg_biology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/53286652168.pdf
    • https://cdn.shopify.com/s/files/1/0429/0999/1075/files/dads_worksheets_division.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/wevotubivelulukobajolu.pdf
    • https://cdn.shopify.com/s/files/1/0461/4337/3480/files/binding_of_isaac_wrath_of_the_lamb_cheat_engine.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/vekekitujamebenipijena.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6823/files/descargar_sticker_maker_for_whatsapp_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/skyrim_child_overhaul.pdf
    • https://cdn.shopify.com/s/files/1/0432/2364/6365/files/zekekesofejok.pdf
    • https://cdn.shopify.com/s/files/1/0447/9696/9121/files/assertion_and_reason_questions_for_aiims.pdf
    • https://cdn.shopify.com/s/files/1/0429/2424/5155/files/adobe_photoshop_elements_8._0.pdf
    • https://static.usrfiles.com/ugd/a107db_47d809035493478abd5d88e2ee9c54a6.pdf
    • https://static.usrfiles.com/ugd/4bb894_06a960926c8a410bbccf38c1ca13af55.pdf
    • https://static.usrfiles.com/ugd/6924eb_22f8af8a404444329bc0e92009a21004.pdf
    • https://static.usrfiles.com/ugd/b8c837_48451f4ba34f41afbb27b13978a82b50.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2ba7c7dd6148fb955195fcd3266268.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_off000056b6.bin
04738b621a10f14914462b0e4d29ac8c15e91936b8a218babb5d16429a76dfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B6 4800 bytes
font_01_sfnt_off000066ca.bin
1bda197e0d6872c207f3c0522bcd1a0b84933dd415bb9c4015f70c5a84f067b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 10204 bytes
font_02_sfnt_off000089be.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BE 4324 bytes

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