Malicious PDF — malware analysis report

Static analysis result for SHA-256 732bbf38addf3989…

MALICIOUS

PDF

45.5 KB Created: 2020-07-28 22:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a891fb004e2a1d144ccdc33fcc70745 SHA-1: 25b54b8e1dfd5e63577c747794d591583407ac18 SHA-256: 732bbf38addf39893a73a9392b46ed2a00328de64a85d247045e44dd5bc883ed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the embedded links. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent 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.ru/pify?keyword=capitalization+practice+worksheets+6th+grade
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • http://files.brandon-ind-deburr.com/uploads/1/3/0/7/130738823/zewinijo-jirobepoxeduw-bamivemevevedo.pdf
    • http://files.shopsweetnspicy.com/uploads/1/3/1/3/131379034/melegu-gemozoxoguxe.pdf
    • http://files.wwemd.com/uploads/1/3/0/9/130969012/gepukin_buporezuwizugaf_kamibiwowigax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/notetutus.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/72398519767.pdf
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/gomizinofubun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/fagax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/6070378288.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/wobomixowadajiko.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/8754732500.pdf
    • https://cdn.shopify.com/s/files/1/0434/6914/4230/files/muvabeve.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/rejenusedasojusolivib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/10439773708.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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_off000073e9.bin
26cb3394d3d59bc6ede41fe2400a9b11ae6c4ff3d0f34dd725b04b69c08ff729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 5504 bytes
font_01_sfnt_off000086b2.bin
ef33c6499acf8a967abbadd7b4e1f97d09297cc37e4a33a1b04462dbc94005ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B2 10028 bytes

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