Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c3120b17d1b99…

MALICIOUS

PDF

60.3 KB Created: 2020-09-01 12:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a7211cea5acd7f77e14b4ef6a8fb134 SHA-1: da9fe6dfb6fe94d0568fb24aba9ea0f10154c7b4 SHA-256: 136c3120b17d1b99dcb3d8daa64a0fa8a54acaafec106e1823d3e78ee855bc10
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=clinical+practice+guidelines+hypertensive+urgency
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/3757/3529/files/80275322818.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/lamemebolaxuponopeboku.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/shadow_of_the_horned_rat.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/bapuzaxelemavanimobawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/67319339202.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/19179099867.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a3294d0fdd43828a85bcd1b00c5cf5.pdf
    • https://static.usrfiles.com/ugd/e2c250_9392e6af324346adb6fc672cb8e01399.pdf
    • https://static.usrfiles.com/ugd/b8c837_48f77f2cf4a64f738f36d47e914ca929.pdf
    • https://static.usrfiles.com/ugd/3aee12_d0d92d78f0634ee4938014254ce83ded.pdf
    • https://static.usrfiles.com/ugd/b8c837_e31805ad2bf1404c9b482ac49583b423.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c41bea29aba489cbd092bdc608078f5.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_off00009e4d.bin
af49a20d5402d93e8794d4851d92712b583c359dd47433c52f151912fe1b927c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4D 5404 bytes
font_01_sfnt_off0000b0aa.bin
61ed6a80db7a1e61fe1fb25a29d731611f4d9dcb5f3c5a5f5715b5ed334d4b46
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 15880 bytes