Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3e4b4166c8ea26…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 20:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8579bef6ca6ea73f6582d84d71c366e SHA-1: b20be46278efd044f75758571783cc2ce08786a5 SHA-256: 3a3e4b4166c8ea2676aa115eec6ae3804cbffae5e20bbc2f2130a2b5adcdace5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wb?keyword=kirloskar%20submersible%20pump%20manual'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for phishing or malware distribution.

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/wb?keyword=kirloskar%20submersible%20pump%20manual
    • http://geneluvag.oasis-network.org/uploads/1/3/1/1/131164066/ea9b8db51d.pdf
    • http://files.canadamt.com/uploads/1/3/1/4/131409574/5612647.pdf
    • http://files.lydiadallas.com/uploads/1/3/1/8/131871583/6973132.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/kovetux.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/32023384873.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/nuvufupojazufexobikolote.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/52467945968.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/mcmurry_8th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/network_layers_osi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/74939472618.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1519/files/10th_class_math_solution_chapter_6.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/wabotigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/69745534355.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_off000065fc.bin
136211ad697c1b00e0066e8f9f38bd0c4a291e9a9f7cacd9877a362ee307364f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 5140 bytes
font_01_sfnt_off00007756.bin
ebe6ac2e2edf584b7909b9104bdd7f26b1828878ac9d496b996213f08d58bc71
pdf-font-stream PDF embedded font (sfnt) at offset 0x7756 14304 bytes