Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e4b883e86ba43d…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 13:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cb5476952988d627f4279ff1dc450b0 SHA-1: 74da6fad0498c2c98e09a09a6870362c82be693e SHA-256: 75e4b883e86ba43d38149308ae15e9823e6453abb1bce43d5b77caba0e87c7de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains text related to medical treatment guidelines and the `wkhtmltopdf` tool, suggesting a lure for SEO spam or phishing. The presence of many external PDF links indicates a link farm strategy.

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/wix?keyword=epidural+hematoma+treatment+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/zibosewefasawanafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/37445761607.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/80555836696.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/saki_saki_song_video_dj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7531/9448/files/zaromut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/6319662800.pdf
    • https://static.usrfiles.com/ugd/726ec9_9375f78fc86949969c13f6dbef6dd694.pdf
    • https://static.usrfiles.com/ugd/930050_42e8fcf7c59a4c019b120f7839e7a784.pdf
    • https://static.usrfiles.com/ugd/e6092c_5152117463aa4b0fa912e269e7fac404.pdf
    • https://static.usrfiles.com/ugd/df73ab_2782e34a14d94694a4d41f3eed14e559.pdf
    • https://static.usrfiles.com/ugd/eda9ba_09deefe3f7104deda7a4b14217fd6a3e.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/38968034157.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/zedejojul.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/6855951657.pdf
    • https://cdn.shopify.com/s/files/1/0437/1985/2187/files/3ds_games_cia.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_off00006e4e.bin
53204b140c2558743d3ec80368552cc8c2fb4af74eb43137c6f339d04634b778
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4E 5328 bytes
font_01_sfnt_off00008041.bin
eda88561d0c51903dfa8b2623431adf289ab5fe9a5680fb6904ff1a6f91a2a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x8041 10144 bytes