Malicious PDF — malware analysis report

Static analysis result for SHA-256 8627f1fdf0d3e461…

MALICIOUS

PDF

54.5 KB Created: 2020-08-07 23:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 388e3f80205979118534a184d1b55d3a SHA-1: ea4b96579aee9e41177041f72a968eaa0fc10f24 SHA-256: 8627f1fdf0d3e46104147bc93af494655b0a1a424c7af79e7dcb16edefdff0b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to a malicious URL via a deceptive link within the document.

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=bible+believers+archaeology+pdf
    • http://files.stanselmsofshoreham.org/uploads/1/3/0/8/130814769/9df4d.pdf
    • http://jozake.petraschool.org/uploads/1/3/1/4/131407818/sidegezolesi.pdf
    • http://files.nancydcreativeart.com/uploads/1/3/0/9/130969580/e56ccc4.pdf
    • https://cdn.shopify.com/s/files/1/0429/1005/6615/files/dezizesigafud.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/concord_4_program_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/41151267662.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/98230363060.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/micrologix_1100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/mewimozasezukazafot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7991/5934/files/gawiwezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/44462391209.pdf
    • https://cdn.shopify.com/s/files/1/0437/9036/8929/files/23350952394.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_off00007c12.bin
87d984c9c26997453b392d2f76f364186b68851ff59c967a85b9439da88042e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 5768 bytes
font_01_sfnt_off00008fbf.bin
ca5de81f1c878bb20a1b6d49c033bdda33c798b15c82c74a95503ea6c3c9bfb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBF 10368 bytes
font_02_sfnt_off0000b366.bin
0a20a8e8b0f8544fe7d41a36d7428942c757b7875effd204c10228aece9f4358
pdf-font-stream PDF embedded font (sfnt) at offset 0xB366 17172 bytes