Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b974e649395c13b…

MALICIOUS

PDF

53.4 KB Created: 2020-08-30 01:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 274be3d3b0aaf670f5da7cbffb181689 SHA-1: d5b27f4cc1855c547d91aaa9b75d686a6d7441d2 SHA-256: 2b974e649395c13bea0d25f6798bf4ab3094f2628bd081c5f5e9fdaf5fd762d6
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.com/wix?keyword=realm+grinder+eligible+artifacts', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other links to Shopify, suggesting a tactic to disguise malicious redirection within a large number of seemingly legitimate links. The ML classifier strongly supports the malicious nature of this PDF.

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=realm+grinder+eligible+artifacts
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/velidexowegosotosazazinan.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4971/files/chicago_manual_of_style_in_text_citations.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/9554127961.pdf
    • https://cdn.shopify.com/s/files/1/0437/7434/5365/files/89892273222.pdf
    • https://cdn.shopify.com/s/files/1/0463/0393/6669/files/unity_2d_animator_sprite_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5675/files/46290416263.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a46efa61334b1a8f11765b61ed0241.pdf
    • https://static.usrfiles.com/ugd/a18aa6_29bc2a97e174414497d26a35ebfc3807.pdf
    • https://static.usrfiles.com/ugd/b8c837_88f9f808c7174413afa36194e9306ed1.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/1158695859.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaxigosileworu.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_off000085d1.bin
b063c13385425c68a4f09491319fed0396650962ce584dbc4ab9ddce9807fd3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D1 5164 bytes
font_01_sfnt_off00009742.bin
3a1a930c03241ecf43e1476f6c7a201775e2b34903f153a3fb09802f976226d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9742 10576 bytes
font_02_sfnt_off0000bb34.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 4324 bytes