Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09d2820da22bcde…

MALICIOUS

PDF

38.6 KB Created: 2020-10-12 02:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 56c6d7ddd2166a34d676fd535464b916 SHA-1: fe2a1e9f5f421d92777a1037e43da2e1d4a51245 SHA-256: a09d2820da22bcde4ab4f3119caeff39d0094eff9d614608e5027443c5ed5669
224 Risk Score

Malware Insights

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

The PDF contains a link farm with a critical redirector link, suggesting it's designed to lead users to malicious sites. The document body text, though garbled, contains the URL 'https://ttraff.link/pify?keyword=kasper+trial+reset', which is also flagged as a malicious redirector. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic of providing password instructions to bypass gateway scanning, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=kasper+trial+reset In PDF document text
    • http://files.joepeatfield.com/uploads/1/3/1/3/131380619/rujonej.pdfIn PDF document text
    • http://files.twentyfiveknits.com/uploads/1/3/1/1/131164002/vexaziz-bufaxiwavapek-pipukivepexugen.pdfIn PDF document text
    • http://files.ijbe.online/uploads/1/3/1/4/131407278/281b9945f59d.pdfIn PDF document text
    • http://files.shopblingcandyboutique.com/uploads/1/3/1/4/131406535/5252205.pdfIn PDF document text
    • http://files.jungjean.com/uploads/1/3/1/0/131070071/saxejunase-zipugabugim-vafaki-koguvutulor.pdfIn PDF document text
    • https://site-1036689.mozfiles.com/files/1036689/54278441450.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/17318726041.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/zazirip.pdfIn PDF document text
    • https://site-1039722.mozfiles.com/files/1039722/86719423184.pdfIn PDF document text
    • http://sojap.millstadthistoricalsociety.org/uploads/1/3/1/1/131163859/a089b2ebfa2724.pdfIn PDF document text
    • http://sefeses.texastromboneinstitute.org/uploads/1/3/0/8/130813829/d262117f1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8456/9494/files/revere_ware_tea_kettle_replacement_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/libatitomovusekibasotuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/calculus_early_transcendentals_jon_rogawski_2nd_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC7 4780 bytes
SHA-256: 1bcc3213780d615cdc97978e4896908dc6c16013567988957f8efdf933359e6a
font_01_sfnt_off00006b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1D 10156 bytes
SHA-256: bf5b3f68d849683c42b7391292da1a4e810b1485bc2713fe8db8e07f75e7489a

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