Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7bb5773f9aa9b7…

MALICIOUS

PDF

43.3 KB Created: 2020-08-18 19:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef49b8ee5783e7cf4b3340d14ac644b9 SHA-1: ee7a82d2d9975c83d58c38040491204ecb53b627 SHA-256: 4f7bb5773f9aa9b72961ffb5e0bb33237298bf425993969f705facddf95e940b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a lure to external malicious content. The presence of a link farm heuristic further indicates an attempt to distribute malicious content via numerous links. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=android+9+call+recording+xda
    • http://files.templebhajanband.com/uploads/1/3/1/1/131164399/6ff80391cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0933/files/21394615735.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/bendix_king_dph_radio_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/35796914304.pdf
    • https://cdn.shopify.com/s/files/1/0435/1151/3252/files/gator_scooter_repair.pdf
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/46478272908.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/tagulafagogowav.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/29576599656.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/history_of_great_britain_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/pegemonifuvi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/climate_change_agriculture_and_food_security.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/xagamizegivilejuzubavagud.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/89710532927.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/cover_letter_for_agriculture_job.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lapifobojupe.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_off00006bc4.bin
f48a87123e3bf41d282b918cf59c09082a581a1da55a985f651a9b2651b6bad6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 5144 bytes
font_01_sfnt_off00007d4c.bin
17ec1d2b97645db9393444eb838496454796791a1185e180ab974abf6e9dd32b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4C 10316 bytes