Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbef04ca73c39a2a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-14 09:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21641aad6d02c4d0784e4098a242cd5d SHA-1: 0bb451cd0c2deef3a0b884e10b81b97352933499 SHA-256: fbef04ca73c39a2a98c7092e822a3a64855ba0b8a7337803a8b6e3187342ff17
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=n64+emulator+online+multiplayer+android'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

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=n64+emulator+online+multiplayer+android
    • http://files.messybunsandlittleones.com/uploads/1/3/1/6/131636642/2353191.pdf
    • http://files.theexchanged.com/uploads/1/3/1/4/131438759/6475621.pdf
    • http://files.onesacredmedicine.com/uploads/1/3/2/6/132681823/3313356.pdf
    • http://files.inspiredlearninglab.org/uploads/1/3/1/4/131437172/7144681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf
    • https://cdn.shopify.com/s/files/1/0428/6860/5095/files/kelley_blue_book_used_classic_car_values.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/rurolaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5721/5648/files/best_book_for_learning_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/income_tax_slabs_for_fy_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/97459880162.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/7084513125.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/92883055521.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/wejaxaxabisudafaketeratu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8026/0511/files/codex_alimentarius_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/sweet_apple_acres.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/zupoperokixoroga.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/98881566528.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_off000059b7.bin
eac1de32495ef7f0eeac605a486c7ea1125873a8de2f52cf81abf4c9a2c9b44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 5240 bytes
font_01_sfnt_off00006b80.bin
78e145e643d9398aa970676cb26c6cbf31dca0120190636410ca80977d817f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B80 10060 bytes

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