Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c82e6b1f4b5881…

MALICIOUS

PDF

44.1 KB Created: 2020-09-02 21:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0160c2992ddb2b254721c2f7724fd80a SHA-1: 32746b7e63eb867ee7791f73719839320e03761a SHA-256: 15c82e6b1f4b58817b2f5b22251910863cf4aceb63a3a0fe7607611a88a7922d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.club/wix?keyword=beginning+spanish+to+english+worksheets'. Another heuristic indicates a large number of external PDF links, suggesting a link farm strategy. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the link farm structure indicate an attempt to direct users to harmful content.

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.club/wix?keyword=beginning+spanish+to+english+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_f6454569ec054182aca7b573c3613ff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f2b8e7dab6147c78548b4e5b26f0096.pdf
    • https://static.usrfiles.com/ugd/b8c837_778f982f150b4c5383f404ff608f319f.pdf
    • https://static.usrfiles.com/ugd/f103bb_7397a6eb74d843638b329de22393950d.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_7d9c73dc6c2a480ead2358f3b34c4ea0.pdf
    • https://static.usrfiles.com/ugd/a467d2_c78a2c2b26664274b7d8c6eda935fe63.pdf
    • https://static.usrfiles.com/ugd/5be868_175aa2c30a4e48479a2343413cb71a03.pdf
    • https://static.usrfiles.com/ugd/3615fb_544a31741a014569a75ea21104a4c5c7.pdf
    • https://cdn.shopify.com/s/files/1/0438/0652/3552/files/87017928962.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/29705898514.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/64116025717.pdf
    • https://cdn.shopify.com/s/files/1/0432/3750/7240/files/lamadumag.pdf
    • https://static.usrfiles.com/ugd/7e6083_9810fd9c18fc4cea9782cadfdf523735.pdf
    • https://static.usrfiles.com/ugd/82e28d_db1d9222d5c64550acde37d7481900c5.pdf
    • https://static.usrfiles.com/ugd/9a242c_c50064d36dfe458ebbd54313584e46a8.pdf
    • https://static.usrfiles.com/ugd/469aea_20aa5a1e6c22451694ec7fcb7fad871a.pdf
    • https://static.usrfiles.com/ugd/bf07b1_c6b2b016705548fb9bfdf16146195d8f.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_off00006e2d.bin
259a6f0521dc5199777ad442c04bbbd5772805422f9fa9065245bfca041d4499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2D 5284 bytes
font_01_sfnt_off0000803b.bin
5d6e689239ea938b2eb6ecafed0fd4b8772b149d7390a502c01d84559654d9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 10144 bytes

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