Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9db0251d2ae30b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 14:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5b12d0861e9315116b09dcdac65603 SHA-1: 2891888531bd2e6bdd0be7287b37ab5795eb8127 SHA-256: 3f9db0251d2ae30b8f514e5df7432ddb54485168cfc159d2173dbc5d6fe9b50b
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=werewolf+transylvania+discord, which is likely the primary malicious payload delivery mechanism. Additionally, the PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to distribute malicious 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.com/wix?keyword=werewolf+transylvania+discord
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/basic_civil_engineering_notes_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/64903994085.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/compound_adjectives_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/ziwevujetedofujeruxowolot.pdf
    • https://static.usrfiles.com/ugd/4725f1_99972519e11441a49207c93cd8a6f065.pdf
    • https://static.usrfiles.com/ugd/f0e51d_9370a65a8aed422f8329d9091e2289eb.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_807a2df25e884c90a6c6d3b10d2c1958.pdf
    • https://static.usrfiles.com/ugd/b8c837_893b824729e540a7a7df4385467bf7b6.pdf
    • https://static.usrfiles.com/ugd/eb4c03_388a8a51ecae432ca23ef6a6a87b7fdb.pdf
    • https://static.usrfiles.com/ugd/5360f8_577115e00ded48379b3d8aa1c2d372da.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f727f6ac632499190095df9fa5c858d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cab640c009640eda6bf127469db5ad7.pdf
    • https://static.usrfiles.com/ugd/de60da_44973efffe8040e986c0f0e2c4186765.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6704/files/rosukuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/50756926144.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/wudesevaradoworukedipezur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682b.bin
dcf625469d6f82614cc0d401b005375f93895635a77d7a5097f6a6bdeeb90a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 5284 bytes
font_01_sfnt_off00007a41.bin
80a3c7c275c648d7e6cab5f5f08fbcc5f219b2670e17d9ac618bb49811397157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A41 3084 bytes
font_02_sfnt_off0000871e.bin
20f998de521d7ca7bc18a7fdce346d1e9541721c93f3f61dfda934cca03ef6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871E 10564 bytes

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