Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c05ba3e1f932d9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc4cf2586f48fdea33eb7e0a70ea106 SHA-1: 5068b69b79bf0ed8e8385016aab218f4f36acf70 SHA-256: f8c05ba3e1f932d9f04382667272c9894154a63a6a3a0ede27fa45cd0ab95377
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly.

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.cc/wix?keyword=halloween+2018+theme+song
    • https://static.usrfiles.com/ugd/1cc7e8_cb21b4b7e1fd4e4f911cc76ce45ede15.pdf
    • https://static.usrfiles.com/ugd/99a8f2_85971e0681cb4259b23d2d267d616351.pdf
    • https://static.usrfiles.com/ugd/22739b_8ecadb2a877742d19a1e6223d55807ce.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_cfdc3aaf20f04ff7963d3d37e33a8607.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_34f4d7f6aa974cb9a364135f66b8a6c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_eaf3340ce393431a8cf9bcce220e30dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_f139695ee2484889a870e9f9d6725a17.pdf
    • https://static.usrfiles.com/ugd/4bb894_16215a61b87a4f0fae7e5dc9a4cb8c3d.pdf
    • https://static.usrfiles.com/ugd/3d0627_545e3de97b674563ac68d1bce78974d7.pdf
    • https://static.usrfiles.com/ugd/72b0e7_93851746c6a141fbac15a597ad2bf4d2.pdf
    • https://static.usrfiles.com/ugd/1813b3_c56480c53ffc42fd8edff7cd8234fc1f.pdf
    • https://static.usrfiles.com/ugd/429b25_0fc7ffd5de534f80a8c9d61238eb418f.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_82de2d3494cf45fdb749cf4d5ecd46eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_838b1f6d921a45f588b90eeb6c1afaef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/roragijamun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/jebafezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/lakirepuzibaluvofiwozur.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/68856444729.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/bise_lahore_9th_gazette_2020.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_off000067ea.bin
6331a77b7909fe23ee97d72e4949f2ef643f9e814364eec1aec2d519e952abe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EA 5576 bytes
font_01_sfnt_off00007ad1.bin
488f0d85b41b57c8eb12524d0d37edee24839869a5794d257cc34d86bb74d1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 10364 bytes

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