Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b20ac4bb18cd95…

MALICIOUS

PDF

66.0 KB Created: 2020-08-31 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac1f55470209f19df8a1b99f2cae87de SHA-1: 88ccbbd92f7d12a7ff3e572f846f9c964c16c700 SHA-256: 60b20ac4bb18cd95297d3787b9608d4d860891ebd022f750857a756d4a4dbe56
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=easy+to+learn+hci', is flagged as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting it is the intended destination. The presence of many links, including benign ones from Shopify, indicates a potential SEO manipulation or a distribution point for malicious content.

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.ru/wix?keyword=easy+to+learn+hci
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9978/1275/files/boundary_layer_flow.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/counter_terrorist_sniper_hunter_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/4971/9720/files/14665102895.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/41172425791.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fe6bfb818604b0380d7754413a4b16e.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d3486222454cd68abd59b2f62f3870.pdf
    • https://static.usrfiles.com/ugd/e78b77_95a8bac07f7849c3907bd8484d9c6a34.pdf
    • https://static.usrfiles.com/ugd/63022f_3ff4aabeae004efd80614bf6597bb667.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_1079e788249b4c9e85f59076b4910343.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9540df9056c4ca2ac0d3107eba11de8.pdf
    • https://static.usrfiles.com/ugd/6da380_7a024b25b11a4decbd775bbf99abf334.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_off0000c7d3.bin
0f31b084ff8b2658dac2d4767740e464ba5381342d796170f2c7bd4cbf73cf90
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 4944 bytes
font_01_sfnt_off0000d89d.bin
6f6181d354ef8fb4131744dabc50b832a9f3a77939a7f79fc2d0df7f9c2cd39b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10220 bytes