Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8921d542417e7f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-29 18:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c153d8e2117ef083a92ccbc3d83ca6c2 SHA-1: 8f1fbd41092faf9a7c91a1e87b113fed34509874 SHA-256: 5d8921d542417e7f0e16c34998dbeb481dabb63ee827b79b87baab2d2e2f4757
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://ttraff.ru/wix?keyword=resumen+de+100+a%25C3%25B1os+de+soledad+por+paginas`. The document body, though heavily obfuscated, appears to be a lure related to a book summary, and the PDF also hosts a link farm of other PDFs. The ML classifier strongly indicated maliciousness.

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.ru/wix?keyword=resumen+de+100+a%25C3%25B1os+de+soledad+por+paginas
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/lewaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/37808036047.pdf
    • https://cdn.shopify.com/s/files/1/0437/9770/8957/files/73077274635.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/geluvexuwe.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b94b05d034940d8877c2d6facf28444.pdf
    • https://static.usrfiles.com/ugd/b8c837_b60745ba57ee4fd8acdf294bf668ee1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6107023b70e4a7ea57c0ffb23a090bb.pdf
    • https://static.usrfiles.com/ugd/8b2c09_631d2089a3d949da88190e677f91bb7f.pdf
    • https://static.usrfiles.com/ugd/8de238_2b0f07ddb6ad4a9891bf20a604b30730.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c9e756a72e4480692bad3d296c7bd31.pdf
    • https://static.usrfiles.com/ugd/3b7182_c30f5dd776c4463cb5d697dd1d229f5c.pdf
    • https://static.usrfiles.com/ugd/89c6ad_b551720822eb4288a77265e058b94477.pdf
    • https://static.usrfiles.com/ugd/b8c837_43733c1196504b1db6c4a34a0a534cd8.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_off00009054.bin
d1a4adbe9fbb13a743baa6398c9c9d72dd1cad6f4d7ecf74c6f32ac80b9a6bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 5692 bytes
font_01_sfnt_off0000a356.bin
b42b260f64c68322bf957abc68683b3db8744555cf5c30375f18968675cf470d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA356 11360 bytes