Malicious PDF — malware analysis report

Static analysis result for SHA-256 31702c16549152de…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 01:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40b140abc82596c771bc7515524224c SHA-1: f8dc6410146ed525cff6726ac4dd4e8f0290eb87 SHA-256: 31702c16549152de5fd51ac4b5c2445755121b0093cddb24988846b6cea0cb02
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO spam or to redirect users to malicious sites. One of the extracted URLs, 'https://ttraff.com/wix?keyword=describe+john+proctor', is flagged as belonging to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be mostly garbage data, but the presence of the malicious URL is a strong indicator of malicious intent.

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=describe+john+proctor
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/rogawokusop.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/nalatoluzamomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/surijetubenalaxixal.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/systematics_of_living_organisms_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/gafumefapezogupizodelug.pdf
    • https://static.usrfiles.com/ugd/b8c837_07761a20b169468d989b6dfce4f0a24c.pdf
    • https://static.usrfiles.com/ugd/b8c837_831429a911fb4c8d8575bd1f4600c878.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af24ecf0bba47659ff368e76001415e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4a0729e245046edae04b76f9e289909.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/xizomok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8758/3650/files/6181862648.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_off000050a9.bin
16af8ee7a7663c2e38069f9be644fb0ec6e344c2ed3c87cb5d6e68ea50ef6460
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A9 4992 bytes
font_01_sfnt_off00006198.bin
024e9fd91f201c30c6b79417b05bb87ab792a3012a81e31da514c93854034a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6198 10016 bytes