Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75f85bb2be72974…

MALICIOUS

PDF

40.2 KB Created: 2020-08-22 00:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21da5f2a0599666cb5241678c595ae2e SHA-1: c741a03d00cf261c40b30e7e3506efd142c2261f SHA-256: e75f85bb2be72974cd3429b88951d034f2a6c27eeee04ccfd54482cda69a0293
154 Risk Score

Malware Insights

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

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 a known malicious redirector, ttraff.ru, which is presented as an 'alesis dm6 assembly manual'. This indicates a social engineering lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=alesis+dm6+assembly+manual
    • http://files.marisamsorce.com/uploads/1/3/1/8/131856191/takem.pdf
    • http://files.livingwatersmissionschool.com/uploads/1/3/0/7/130739648/kaximirivulinofi.pdf
    • http://files.g3race.com/uploads/1/3/1/4/131483337/dagabirukosur_zuxifipos_xuzovugituk.pdf
    • http://somibubuk.indianaguitarcompany.com/uploads/1/3/0/7/130738993/5235212.pdf
    • http://wakivoxix.mrskestin.com/uploads/1/3/1/4/131453870/4257181.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/gizijemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/pemoxenupesevuriganajafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/7130878607.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/ziwajebasuzuvemafusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/97112087217.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/80753737190.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/basic_electronics_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0463/5607/0561/files/75606196682.pdf
    • https://cdn.shopify.com/s/files/1/0429/4426/6399/files/80936218485.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5861/files/11268571222.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/ashok_kumar_singh_english_grammar.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_off00005f56.bin
838784682070e977007be3091c35f89c94fbb6a1106d9bce0b1b7302f9261a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5260 bytes
font_01_sfnt_off00007121.bin
9036f8061dcb8ada5b8bf769650ff8e947ae0bfcad6c70599034d739a43d3b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10220 bytes

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