Malicious PDF — malware analysis report

Static analysis result for SHA-256 8222b35f1bd23e4e…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 12:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f36064985d1d10bf872c44c2a8eb2e74 SHA-1: ac00fab1484df3b0f09fbcac3d9bab54221b27f5 SHA-256: 8222b35f1bd23e4e743e4023d464adbd35298536a939d6d55d9a685528002b04
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 'ttraff.com'. Additionally, it exhibits a PDF link farm pattern with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to malicious sites or potentially distribute further malware.

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=of+1010+ebq-plus
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1401/1555/files/category_theory_for_programmers_scala_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/bofemozofin.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5196/files/proportionality_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1982/8386/files/10302599163.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/zawanilajorusipos.pdf
    • https://static.usrfiles.com/ugd/b8c837_034fe068f00c4feab4e6424493976977.pdf
    • https://static.usrfiles.com/ugd/cc089a_3788ab6a9b664dee888d43abb4dce088.pdf
    • https://static.usrfiles.com/ugd/33ab24_03d66f85f5e84a16b9265429d3577091.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/lofilev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/25206546590.pdf
    • https://static.usrfiles.com/ugd/5de1df_99967d4afa7e49dbabd54a4c94d3dc00.pdf
    • https://static.usrfiles.com/ugd/b7306e_0fb42ee0a2624ab4b8c9dde9f9333245.pdf
    • https://static.usrfiles.com/ugd/5e8de6_310873203fa749689c4d9ec58f433d6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb192fea79f455997aa342fe78ed78c.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_off00004b14.bin
d36b8361a99da7c366bb6baf816737e1bc72fd9987d10ff12abc1d33889c44d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B14 5108 bytes
font_01_sfnt_off00005c96.bin
d01b64ab041b8dec697de89c11970d5b8aa715b110488c16bdcf547362206c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 14180 bytes