Malicious PDF — malware analysis report

Static analysis result for SHA-256 4929bf374eb43238…

MALICIOUS

PDF

67.0 KB Created: 2020-08-29 06:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53bd57dc04e834f9f51db8c71f206d9 SHA-1: a39d98f7577d55498b977350332e88c89851a97c SHA-256: 4929bf374eb43238a4be228c47ebb65486150e624da4d934da128cf7a9ec82c3
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'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of an SEO link farm, with numerous embedded links, likely to distribute malicious content or traffic. 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=zoology+by+miller+and+harley+4th+edi
    • https://cdn.shopify.com/s/files/1/0434/0636/0730/files/kifetupidokezosulu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1344/5544/files/2684278865.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/66612713019.pdf
    • https://cdn.shopify.com/s/files/1/0434/4699/3052/files/dabatelenunajunoramav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/kawezoxekeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd441db7549d4c7fa01e7bda31f367a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_26b44f289cf9405e9b6eb01e7ceb64d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_50c5f36120034c78a994adac33fb97bf.pdf
    • https://cdn.shopify.com/s/files/1/0469/3318/0571/files/tusitazerujokevimaxepeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/limiting_reagent_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/xoder.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/54322405396.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/lanosukasuwiwokela.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_off0000bf28.bin
0746c4635d3be702f021e52df0a3a2c5b15c6418721d20a48e5ddc0bafe33cec
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF28 5348 bytes
font_01_sfnt_off0000d137.bin
44787ca16455aecf6f70eefcf91d6fb7b1144df34736d40e744e90af63c0892e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 14440 bytes