Malicious PDF — malware analysis report

Static analysis result for SHA-256 175495bf4fff0b28…

MALICIOUS

PDF

41.1 KB Created: 2020-09-04 09:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b2abf4e46450b247defa1d7f64508a SHA-1: f17c2fa41fab471a51a85ed22a23bc7a369d44db SHA-256: 175495bf4fff0b2878ef508e6139cf56e6651e01443cb0934367323d9da0f46e
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to a redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=checkedtextview+style+android, which is known to host malicious content. The document body contains garbled text but also includes the malicious URL and several Shopify links, suggesting a link farm or SEO manipulation tactic.

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/wix?keyword=checkedtextview+style+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/26708655152.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/kedanubaneroge.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/milton_areopagitica.pdf
    • https://cdn.shopify.com/s/files/1/0463/5803/6641/files/acalasia_esofagica_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/dengue_guidelines_2016_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0447/9965/6087/files/the_game_pick_up.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/milogixox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/gift_certificate_template_publisher_2013.pdf
    • https://cdn.shopify.com/s/files/1/0439/0964/4456/files/new_era_super_bowl_party.pdf
    • https://static.usrfiles.com/ugd/d48fe3_fbd38b20159b46e0a5cbed590ce12200.pdf
    • https://static.usrfiles.com/ugd/ee4d88_5de0cf48d1034619916f376d3864829a.pdf
    • https://static.usrfiles.com/ugd/b8c837_62918db86f814b9ab2c56ab61585f3c0.pdf
    • https://static.usrfiles.com/ugd/c345b0_c1a89161a8e84e47b133aae5388c8387.pdf
    • https://static.usrfiles.com/ugd/b8c837_af9f47ef1d0647a697260afccf296c92.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_off00005f4d.bin
696051c507178fba25deb0b5a239d328e0cccb58313cff924d8e532dcaf6cece
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 5316 bytes
font_01_sfnt_off0000716e.bin
22855115e04f862acd7689605afe6dd03792ee002ff279264aaf89d28d3b778c
pdf-font-stream PDF embedded font (sfnt) at offset 0x716E 11220 bytes