Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ffb4053c5b65c2…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 01:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c79fa241330b9cd30d848cba5f3ad29 SHA-1: a5c0c61c6c4436d4e40a0abea593261c9a5015e6 SHA-256: f4ffb4053c5b65c20d16ea02dd19d376ca0343f73a6a1ebcbbc3aafb1a47b7dc
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify and static.usrfiles.com domains. The ML classifier also strongly indicated maliciousness. The presence of these numerous links suggests an attempt to either distribute further malicious content or engage in SEO manipulation for malicious purposes.

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=grim+dawn+cinder+wastes
    • https://cdn.shopify.com/s/files/1/0432/4045/6360/files/47873049981.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/60749446761.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/kuvolilibulezoxa.pdf
    • https://static.usrfiles.com/ugd/3cb679_6dc6806244fa4c53be8142c9820d3ac0.pdf
    • https://static.usrfiles.com/ugd/97634b_408717eaf0064c4080f7cd6dd9e314ed.pdf
    • https://static.usrfiles.com/ugd/3f80ec_c81926fb369e4bd0853b4f514f0e8855.pdf
    • https://static.usrfiles.com/ugd/b8c837_42c352870c6d464aa2ba5c4fa26692ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0618a34573440f1a81cb9f089fdd66b.pdf
    • https://static.usrfiles.com/ugd/b7ed05_e2b0939ff4f3445f95b0f3625f158924.pdf
    • https://static.usrfiles.com/ugd/b8c837_33c861e9f9e64a55908694443783754d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc9ff70fd914d5fa4a2ff22bcb19ab2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0675bf0d342c4dc788b86726e2943cd5.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3061/files/70311760020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/kaantasan_ng_pang_uri_worksheet_with_answers.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_off00005caf.bin
b9613cae67b6d01bbf2925afe6d7fe1160b9c8a4960a6b66f80be575531b2c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAF 5176 bytes
font_01_sfnt_off00006e43.bin
5713326ec21acdc3f541922ab662cbf16cd725378e0ed576749fdd0abe097bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 10296 bytes