Malicious PDF — malware analysis report

Static analysis result for SHA-256 f826080eee57f7f4…

MALICIOUS

PDF

46.0 KB Created: 2020-08-02 23:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137bc2e1e3e8723c099938b395317c01 SHA-1: 61f91b51d622486de07b74a14ed1142289c4077b SHA-256: f826080eee57f7f4892a78dd94465ec468bb1d86b4dcafc05cadb6afa8a09b4e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for video compression software. The document body contains garbled text but also repeats the malicious URL and several benign-looking Shopify URLs, likely part of a link farm to obscure the malicious destination.

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=handbrake+compress+video
    • http://files.cantonbarbell.com/uploads/1/3/1/6/131606046/wuxusexetodi-zaromodex-bajomokusu.pdf
    • http://files.trailblazersunit.com/uploads/1/3/1/4/131454492/431ebdecedab3e0.pdf
    • http://files.victoriaesquivel.com/uploads/1/3/1/3/131381204/tegixovisezig.pdf
    • http://files.goacesfootball.com/uploads/1/3/1/4/131407818/04cf919b.pdf
    • http://files.nbcspringfield.org/uploads/1/3/0/8/130813325/90f0aa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/sifefupadoxasiluron.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2412/files/70051892591.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/devedajulojabamifamupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/muzalagis.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/podisejivelepabovovepimub.pdf
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/litanenuvamajobobojil.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/fumimikivifeviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48675385277.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/78340915065.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/rodugonanirajizerotevenof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/mixedupokanirofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/moxamivevusuzadifuvepepon.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/67180328313.pdf
    • https://cdn.shopify.com/s/files/1/0428/2685/8662/files/31671597452.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_off00007584.bin
24c85ee2f151aee989d4ff026d91fd94b8361ba222e1b5a948e089ce5c6d85fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7584 5412 bytes
font_01_sfnt_off000087d2.bin
de62a2bcc75bedf2690cd8bde52e792adeff398e6923592a289d811b875eca73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D2 10128 bytes

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