Malicious PDF — malware analysis report

Static analysis result for SHA-256 18167ac757e06d58…

MALICIOUS

PDF

33.2 KB Created: 2020-08-17 01:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2190ba5e7c694e29294ac2e3f85c8a14 SHA-1: 17444122ede461fbee2bd7b864c47dcdb7015031 SHA-256: 18167ac757e06d58f0fbace78bcaeaf6fe16dae5a668f7da4a2062642748d75b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits a PDF SEO link farm heuristic, indicating a large number of external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.cc/pify?keyword=crash+bandicoot+android+rom' is the primary IOC, likely serving as a lure to a malicious site.

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=crash+bandicoot+android+rom
    • http://files.underdog34.com/uploads/1/3/0/7/130740572/moderewagove-gijodi-zuwedoferawaxo.pdf
    • http://files.operationglobalfreedom.com/uploads/1/3/0/7/130739214/talafu_kodut_pawaza.pdf
    • http://files.christinebrumbaughdesign.com/uploads/1/3/0/7/130739376/2056645.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/jojij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2467/0105/files/86890814788.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/guwirarobatoxezilaroxoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/lokubovorusowex.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/oxford_picture_dictionary_english_german.pdf
    • https://cdn.shopify.com/s/files/1/0432/7256/8996/files/nusodenufire.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/banking_and_finance_project_work.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/75608787221.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/car_games_parking.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_off0000447f.bin
c1aa871dd366cf29efbcfa36e98f4e1e0d00bc86890a3d445baf58b91e0512db
pdf-font-stream PDF embedded font (sfnt) at offset 0x447F 5192 bytes
font_01_sfnt_off000055ed.bin
75637bdc30add8b357898cbf8e90ddaa713194891dac05bf8c78693836551260
pdf-font-stream PDF embedded font (sfnt) at offset 0x55ED 10104 bytes