Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e51e13a8171e98…

MALICIOUS

PDF

45.2 KB Created: 2020-09-11 02:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bc0f52092f6f017399e98673a2a997 SHA-1: db5950bd6d277f3c73d2685e542a76070c69d1ee SHA-256: b8e51e13a8171e987b57297b4d7ac8f4c8ffa4824913740b100b2036a83292f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to 'ttraff.link', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to 'Better Call Saul' and episode guides, likely serving as a lure to entice users to click the malicious link. 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.link/pify?keyword=better+call+saul+s4+episode+guide
    • http://files.ryderstudios.com/uploads/1/3/0/8/130873826/6680bffb6841.pdf
    • http://boveder.cbmcofmadison.org/uploads/1/3/1/6/131637027/7449492.pdf
    • http://files.alisonrothman.com/uploads/1/3/1/6/131636852/5aa8e188f32e2.pdf
    • http://files.differenttranslation.com/uploads/1/3/0/7/130775659/dekamug.pdf
    • http://xidik.wheatgrasspublishing.com/uploads/1/3/2/6/132680981/e547940.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/aston_martin_db11_performance_specs.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/41281329201.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/suxibanov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/kewugigumepis.pdf
    • https://static.usrfiles.com/ugd/64bd79_fd088661277b4b84bd1c1725d8e23dfb.pdf
    • https://static.usrfiles.com/ugd/8ba634_8008f6d92f26468fa877200ee00973a9.pdf
    • https://static.usrfiles.com/ugd/e4a001_66cc0042ab004ddfbe052b70ecf52ea3.pdf
    • https://static.usrfiles.com/ugd/8c5bc8_1fedb313352c4b879874338831afad52.pdf
    • https://static.usrfiles.com/ugd/735424_18c28a6fa07140dab07059dfc758c7f1.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_off00007303.bin
51d1e113aee416a934f441829aeda252014a7c9be8fd46b1866986daa74bf618
pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 5376 bytes
font_01_sfnt_off00008562.bin
630c0724368bfc6e38fbb85a559179f4be75143ca5ff0ed89c2f56bd722ae3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 9968 bytes