Malicious PDF — malware analysis report

Static analysis result for SHA-256 524dad7fcd6015ef…

MALICIOUS

PDF

44.2 KB Created: 2020-09-05 07:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d9a1e385b1bf067eeccbc11aefe7ea SHA-1: 67bd3c392be197225105620e34d50813454bad7c SHA-256: 524dad7fcd6015efa074e0a8b5d3bf5da030bdd3c244f00e296cf6608a957b0d
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'elements of virtue ethics pdf' and the wkhtmltopdf tool, suggesting a lure. The primary heuristic indicates a malicious redirector link, and the presence of numerous other PDF links suggests a link farm or a method to obscure the malicious destination. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.me/wix?keyword=elements+of+virtue+ethics+pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/property_manager_resume.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/23660937731.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/cartomancy_meanings_of_playing_cards.pdf
    • https://static.usrfiles.com/ugd/353d00_98cbabe1a36e4624b37259c084beda75.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e178cdb969847e5933a8d0d38cee5e7.pdf
    • https://static.usrfiles.com/ugd/269bb8_dd9384f3412041ae9120d1c0bed7f02b.pdf
    • https://static.usrfiles.com/ugd/3aee12_bf6e68d9f8484c5ba6948b0618e7755e.pdf
    • https://static.usrfiles.com/ugd/0511f5_6f36a5709beb4b1c9093ae133746549f.pdf
    • https://static.usrfiles.com/ugd/a01749_7e71f55b02b84368ba9a97d91a4456ba.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_18f29d6a6b054e9ab37bd817f9216a19.pdf
    • https://static.usrfiles.com/ugd/38955b_d2aeecb22fac4ab1ac3ac3949fe3ef20.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_off0000708a.bin
1c2ecd18948a6142109df0efcedfc46a2253e3ca48692056bb1255ae2c3b4111
pdf-font-stream PDF embedded font (sfnt) at offset 0x708A 5204 bytes
font_01_sfnt_off00008222.bin
41851dc61ad4ff85938a9f4199e57dfe676115ddbd5b10371f11ad0d3e053c59
pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 9992 bytes