Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a88abcc30604fc5…

MALICIOUS

PDF

40.0 KB Created: 2020-08-25 15:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5cc808ebdac7e82b48b87ce3565af5 SHA-1: dd28df3765e48dcb08d7198ef400e5aee3bf0172 SHA-256: 0a88abcc30604fc59ac9abb2c4a6b1ee43479f604b2f1b215d8e4108f660678b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=spelling+test+template+for+20+words, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and others, suggesting a phishing or scam attempt.

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/pify?keyword=spelling+test+template+for+20+words
    • http://zudobidi.vfw4809norfolk.org/uploads/1/3/0/8/130814328/4b465bd5.pdf
    • http://files.ehabacademy.com/uploads/1/3/1/4/131454373/rusabixelibasume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/zimeburireperokoriniv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8589/files/12136024795.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/jepaziki.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/xexubovirajefidajuber.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/occupational_health_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/fanawuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/nirvana_about_a_girl_chords.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/69863637107.pdf
    • https://cdn.shopify.com/s/files/1/0441/0304/1176/files/37498947949.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/17046263442.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/93080566401.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/9339194894.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_off00005dd1.bin
fce27b70c4ceffd5fbe272c506e0e1f2c20bd6b61f373563be69e62306a67553
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD1 5832 bytes
font_01_sfnt_off0000719e.bin
d970b5397320a79e4d331a9c84766c89bfc192a311ad4803ccb33e579c6ad806
pdf-font-stream PDF embedded font (sfnt) at offset 0x719E 9700 bytes