Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cfe7253ac3dd45…

MALICIOUS

PDF

50.2 KB Created: 2020-08-28 21:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd9a667aacd4569daa554e1f07f2784 SHA-1: 739396b51d452f9be2edc50748948036dc05ffe3 SHA-256: 38cfe7253ac3dd45e40f1d3f021182a43a869bb775c034251a348a0bb959b55b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=hellsing+alucard+significado+de+s%25C3%25ADmb'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or obfuscated, but the presence of the malicious URL is the primary indicator of malicious intent, likely for phishing or malware delivery.

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=hellsing+alucard+significado+de+s%25C3%25ADmb
    • https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bddd9dbab824720ad073600196511af.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a0d77b368d467cbf1d346bdddbaac8.pdf
    • https://static.usrfiles.com/ugd/b8c837_74942d65a4a642b8b780e8b884f61fd6.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/cae_exam_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/mp3__the_beatles.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/book_cover_background_design_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/18667889645.pdf
    • https://static.usrfiles.com/ugd/b8c837_98f4388ee5e94d30af131694b62b071d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d8d8e51abbd4a3788e7fde0195f5ae2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc8fa00ffa9422d9573937e99067c4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6fa9a903a1f4da1a6b4070563175ce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_538721c2a6c542a3807f4fcdeba1b002.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa28568802844c82bf3acaf25de470f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_699892ac357241d5b7e9cd3e6467d43f.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_off00006b5f.bin
e8484e14d747b6b83656a58d34ef059351c707a0051911774bcc9659de95035e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5F 5496 bytes
font_01_sfnt_off00007def.bin
b95f28a63b50131c1a4cb126b588924b54bc2c337ab1f6f13bee68691bcc5322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 11884 bytes
font_02_sfnt_off0000a4d0.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D0 16092 bytes

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