Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7e8b574a8ff9d0…

MALICIOUS

PDF

39.8 KB Created: 2020-08-23 11:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8aef943ad7aecbd3c2e7370bce38f7 SHA-1: 7947a86332ebf4b335676c8f610f69fa9d6e7049 SHA-256: bd7e8b574a8ff9d007811833f1ab99c541fe433a8a3d1a3c11539f99f9e43943
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely used to obscure the final destination or distribute further malicious content. The presence of numerous links to other PDF files, many hosted on Shopify, suggests a link farm strategy, potentially for SEO manipulation or to host a large number of malicious documents.

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/pify?keyword=gettysburg+licensed+battlefield+guides
    • http://files.pianobeautiful.com/uploads/1/3/2/7/132740361/kosavikadulovatimi.pdf
    • http://files.oscarbaptistchurch.com/uploads/1/3/1/4/131438418/menoxiwisosenimiza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/wimumezabusoziwuves.pdf
    • https://cdn.shopify.com/s/files/1/0439/7383/6958/files/metallica_hardwired_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/fokozinurutopagefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2730/8454/files/lesabusiwinegidemoxobur.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/woxopojugifabudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/jeffrey_archer_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/4552/8487/files/simple_business_partnership_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/78557406398.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/46909046745.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2402/files/29785277816.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_off00005d59.bin
354a77c3fc4318f62057a6c0f1c023636fcba6f651d45e4befd0d149bc69b2b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D59 5464 bytes
font_01_sfnt_off00007005.bin
4abbfa1180c00ca57fe52352edd7bafc598f038e46cc03203fb70c02e67dd808
pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 10092 bytes