Malicious PDF — malware analysis report

Static analysis result for SHA-256 6609509bf21ec3ac…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fe7db5c0a4fb79a57236439424c526 SHA-1: 1817bc00b04f06658f65bc38f8da4b5f347a2672 SHA-256: 6609509bf21ec3acabd2faa89080a2f4c8226790b74476632f3b556d8854b1d1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a video game trophy guide, likely intended to entice clicks. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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/wix?keyword=judgment+ps4+trophy+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/pivelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/wivorurulapoju.pdf
    • https://cdn.shopify.com/s/files/1/0437/4501/8017/files/jakaruxel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/2411304851.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/tokovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/15740759893.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/90333135847.pdf
    • https://static.usrfiles.com/ugd/b8c837_934e2118687c44ffa2d7841d581f7731.pdf
    • https://static.usrfiles.com/ugd/d99ef3_283d246dc8a64d1c9ca54d433cc10414.pdf
    • https://static.usrfiles.com/ugd/33a16d_051772f176bf486ca7ed206c7a13f595.pdf
    • https://static.usrfiles.com/ugd/08fe48_ac698d11382e46158cbcd1a62573ff7a.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_off00006124.bin
0fb140468a054dcabd1cc4340c4ddf8d59a89609c31a8a199fa5c425c3b16afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5308 bytes
font_01_sfnt_off00007315.bin
ade311aee134cfa70d110c0e8275a4fd68c8ada9de6e75e1baf7816dd485d28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7315 10288 bytes

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