Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f972c81b599a9b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 07:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a7423ad97338714a6cac612a03c6a1 SHA-1: ceb9c7174c5e5230e8c3f9c0b0d44d5d0b500a88 SHA-256: e1f972c81b599a9bf6603f1c27734c6301a13dcaae5211bcbec13e79647da49a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=crossbow+by+weilder', which is likely used to redirect the user to a malicious site. The presence of numerous shopify.com links suggests a link farm used for SEO poisoning or to host 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.cc/pify?keyword=crossbow+by+weilder
    • http://files.catskillcougars.org/uploads/1/3/1/3/131381553/d531b7495439.pdf
    • http://files.captivatingcriminalitynetwork.net/uploads/1/3/1/4/131453024/4576163.pdf
    • http://files.apartmrome.com/uploads/1/3/0/8/130814874/8930754.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9953/files/1-_99_thieving.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6384/files/6701904334.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/johnny_cash-_hurt_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/97846778914.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/gugalidefugekasevosabaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/the_things_they_carried_litcharts.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/mekuraxoziles.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/nezefogaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/wakuwokuvogagebew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/limavagedabolefotixaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/xumodezewowotanidu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/86730591235.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006132.bin
a4dee933e49160153f8a87175f12ace57895bb19d3d34c7009aedc1ac03ac62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 4568 bytes
font_01_sfnt_off000070d2.bin
593ca2423d39d0644272950d8b8813538bdb76b01376043404e31e23ab65b8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D2 10124 bytes
font_02_sfnt_off00009365.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9365 4324 bytes

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