Malicious PDF — malware analysis report

Static analysis result for SHA-256 c225d3bfd69ba6a7…

MALICIOUS

PDF

57.2 KB Created: 2020-08-01 06:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9803b4e23dfe5f1ea5d2514c5bd5652 SHA-1: d89ae0019d36b2550dcbda556025613e116fe7f4 SHA-256: c225d3bfd69ba6a71dc2e11c53750fc59f5cc7bd20a7c5573ed30f62547882ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDFs. One of the critical heuristics indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=the+shadow+throne+pdf'. The document body contains garbled text but also includes the same URL, suggesting it's a primary lure. The presence of a link farm and a malicious redirector suggests an attempt to either manipulate search engine rankings or distribute further 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/pify?keyword=the+shadow+throne+pdf
    • http://files.karunaforanimals.com/uploads/1/3/0/8/130874633/vimex-ligab.pdf
    • http://files.ladybosproductions.com/uploads/1/3/1/6/131606537/443892fa10dc2ab.pdf
    • http://files.advancedequinesaddlefit.com/uploads/1/3/1/3/131398036/zejozuw.pdf
    • http://files.pawneecityboe.com/uploads/1/3/2/6/132681617/xofelosuri.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/87478889576.pdf
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/zinuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0437/4124/9690/files/figizexavozej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/96121578756.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/nawowisajeboj.pdf
    • https://cdn.shopify.com/s/files/1/0434/3794/9090/files/61462923232.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/41243779322.pdf
    • https://cdn.shopify.com/s/files/1/0433/2467/0105/files/banosisulewid.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/80486740522.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/nasuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotedijulukamani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/the_list_siobhan_vivian.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/
    • https://cdn.shopify.com/s/files/1/0431/6017/4754/files/961215

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0e5.bin
e6bd6cab696966a4f11f8f7bab5a9d4219d922dadb73571b86cd8bd2e8f719ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E5 5140 bytes
font_01_sfnt_off0000b26a.bin
c616b55c3ff95aaf555f0c7c1a8fc76369124b2a15e70c20e8fa5aa871b8bedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 10864 bytes

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