Malicious PDF — malware analysis report

Static analysis result for SHA-256 e733ccab5851f9dd…

MALICIOUS

PDF

36.8 KB Created: 2020-08-01 21:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13925ed34f90b61e735ef6be048f3640 SHA-1: 7f1e78f5ac2002e26d5d188c4a2463355901c90f SHA-256: e733ccab5851f9dd8285dbd1f39e8de44e6799c60a31f48fe0754ec6cf6d6a80
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. This indicates a link farm or redirection tactic designed to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=biostatistics+wayne+daniel+solutions+pdf
    • http://files.gregsautographs.com/uploads/1/3/2/8/132814147/396baf1.pdf
    • http://files.universalhighways.com/uploads/1/3/1/1/131163859/wisebiguki_jebojure.pdf
    • http://files.middleclassempowermentzone.org/uploads/1/3/1/1/131164260/4652949.pdf
    • https://cdn.shopify.com/s/files/1/0437/9013/9549/files/diniganu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/this_egg_feels_like_polished_stone.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/85170720266.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/66222810611.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/bomaxijenotugifamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/72223502867.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/rorepufosigowasavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/lapikavewilaradojizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/81135585452.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003e71.bin
2164cf14a424120922f920b0c2ed7e6d46b068d1bd948cc35413d0e2ed8902be
pdf-font-stream PDF embedded font (sfnt) at offset 0x3E71 5296 bytes
font_01_sfnt_off000050a8.bin
3b8c759f67b02946ab1fa6f16346ac6739f01721117a8c26921de5571a0f83c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A8 9540 bytes
font_02_sfnt_off0000712e.bin
2289a8b0fb9c787484435e46cde90ac1dc3a58d460912fbd7a30f0e46b2b6819
pdf-font-stream PDF embedded font (sfnt) at offset 0x712E 16152 bytes