Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cf6e71827df149…

MALICIOUS

PDF

60.0 KB Created: 2020-08-21 08:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9692f84aaecc27ee7c3fd27ec8a7523 SHA-1: 4531008a9c7fec455f5ed2c03d98552ef0dff414 SHA-256: 20cf6e71827df1490e4a74c8e75f6df0a657faa9d433a8b458e5de42ffe2b895
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users with keywords like 'microsoft activex for windows xp'. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=microsoft+activex++for+windows+xp
    • http://files.deefacepaint.com/uploads/1/3/1/4/131453588/nezusamumokilu.pdf
    • http://files.thewilhelmadventures.com/uploads/1/3/0/8/130874563/7212480.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/97657889516.pdf
    • https://cdn.shopify.com/s/files/1/0439/4031/5294/files/rajevun.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/xegutanoveza.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/toxosofiguzodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/46841510333.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/josizojuzikojuni.pdf
    • https://cdn.shopify.com/s/files/1/0438/8811/5867/files/zumajudipujafamipisog.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/nogowuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4705/9607/files/27195898515.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/4702891414.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/benexerapuritovon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/44121585321.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/59217321222.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/belepakajenekisavimolij.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_off00007cd8.bin
7484c53889b1ccf82ffecfa2d88785e6098b3824bdf27088cea254e74b941944
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD8 14732 bytes
font_01_sfnt_off0000ac16.bin
51f2d3b4d351151be1bd05c95b889888b58492aa87457a526bec0719cb9b3ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC16 5344 bytes
font_02_sfnt_off0000be6a.bin
4186ce26f713b1032d4fc858dadcf79f759dee0deefb95ed2a27d2d86af0f28d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 10560 bytes