Malicious PDF — malware analysis report

Static analysis result for SHA-256 664edc6f6e920a03…

MALICIOUS

PDF

40.6 KB Created: 2020-08-13 00:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69c6ed49de6c4413179be949b33a361f SHA-1: d9f43aaff8d716ccfca447bae3612c8c0b0c4b46 SHA-256: 664edc6f6e920a030d2e8a34e9d72519ba0d3e6ddf135e930ffc6cb2e7cc0b7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to disguise malicious activity.

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.cc/pify?keyword=bread+baking+process+pdf
    • http://datezasi.theshak.com.au/uploads/1/3/1/4/131452883/f5d31bef.pdf
    • http://files.lukascrafts-innosense.com/uploads/1/3/1/8/131856125/sadukotetepekunir.pdf
    • http://files.countrycupboardantiques.com/uploads/1/3/1/6/131637477/0106c77dfd9433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/phonegap_camera_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/gonurawonikiretovopefesow.pdf
    • https://cdn.shopify.com/s/files/1/0432/9698/1147/files/behavioural_interview_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/bowedenefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/azeotropic_distillation.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/86488611442.pdf
    • https://cdn.shopify.com/s/files/1/0450/4230/3140/files/chuyn_sang_file_nh_trc_tuyn.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/86013377523.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/cambridge_igcse_business_studies_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/evernote_annotation_summary.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_off00005fd1.bin
10bac2a948b6498bf0bfd031387ce56397314cd01199e3f4bc8cfe66b96391e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD1 5544 bytes
font_01_sfnt_off000072b3.bin
8fc9397307482e580eb1c20850a13db8973f071a88a9c3582d75145c1eefd7b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B3 10764 bytes