Malicious PDF — malware analysis report

Static analysis result for SHA-256 565c13365de6c30e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-03 02:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b10e563e20032ed77557c80bf98429 SHA-1: b90a9cf293692671785d0deefd39c301ae875125 SHA-256: 565c13365de6c30e78ea5d5e13da91933e12aad235a183dadd48270ce9203a60
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL pointing to a known malicious redirector, which is designed to lure users to potentially harmful content. The presence of numerous external PDF links, many hosted on Shopify, suggests a coordinated effort to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=newblue+video+essentials+for+windows
    • http://files.gabreedesign.com/uploads/1/3/1/4/131452824/buvoxolagivufife.pdf
    • http://files.all4ucustomcreations.com/uploads/1/3/1/8/131858747/nivojipagi-zapitukag-liboju.pdf
    • http://files.good-plans.co.uk/uploads/1/3/2/7/132712483/nofisabagefazorino.pdf
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/bumajitiroja.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/33693599883.pdf
    • https://cdn.shopify.com/s/files/1/0437/1746/0120/files/73934592510.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/49616614856.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/nivofesevojewuwul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6101/files/60952543195.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/xolajedawapifaxilixiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/27293907037.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/71549522119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2792/files/kexuzega.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/count_dankula_discord.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/xamedizuret.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_off00005993.bin
f91aab9a4e3dda3eed82a060fda55f0fabe54d924592d26d9a32649e9321b097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5993 5160 bytes
font_01_sfnt_off00006b4e.bin
fa903f114d3ddf816c0472b861e075633bcc72fa507c15859a65d06d6d08e0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4E 11268 bytes

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