Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5e853d67ba6888…

MALICIOUS

PDF

42.9 KB Created: 2020-08-03 10:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446625795b92ba9152eb5263385126d0 SHA-1: 520709f69c334b7e40aa71767171bf87ad66feaf SHA-256: 8b5e853d67ba68883d291a281521489f9de2fdcabfaec7c99da82e944a919ff8
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=uppsc%20previous%20year%20question%20papers%20in%20pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The document body, though heavily obfuscated, also contains the same redirector URL. This suggests a social engineering attempt to lure users to malicious infrastructure, likely for further exploitation or phishing.

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/wb?keyword=uppsc%20previous%20year%20question%20papers%20in%20pdf
    • http://buzera.petercosimoleather.com/uploads/1/3/0/7/130776177/xivavo.pdf
    • http://files.theborzoishop.com/uploads/1/3/1/1/131164355/mamuriwegun.pdf
    • http://files.hornsbyptsa.org/uploads/1/3/1/3/131379434/bomujakurufilo.pdf
    • http://files.strosebasketball.com/uploads/1/3/0/7/130776054/2702146.pdf
    • http://files.gatewaylegacyprep.com/uploads/1/3/2/3/132303230/pinorane.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/18377735757.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4490/files/14631976073.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/20062699921.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/vewesasusu.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/95644842288.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/24554540291.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/minoduwevitudis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/kidde_smoke_and_carbon_monoxide_alarm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/gulavimofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1914/0253/files/togekowineduguxidegur.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/stevens_320_12_gauge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/vapadubujene.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/nitifasirowe.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/1/0428/9835/8432/files/4441124422

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b3.bin
6477859dbb39791de4cf1edb2d66a357d902565bfc166c6b0f1a3712a8394a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 5396 bytes
font_01_sfnt_off00007b29.bin
e2e617a42dc1b5fab5a3d1dc72b8f839df548b646bed721c1f13f24680031157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 10292 bytes

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