Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a143c67a518a4f8…

MALICIOUS

PDF

39.7 KB Created: 2020-08-07 16:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a803cde8f9b7071a57f3b2a4f93dae94 SHA-1: b67aaf9826fbdb3c9880e32e38f818feb84b4a06 SHA-256: 1a143c67a518a4f86f368c4226684304004a3ab6380fce694299116e0e852ccc
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 likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same lure text as the redirector URL, suggesting a phishing attempt. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used for SEO poisoning or to distribute 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/wb?keyword=masones%20argentinos%20libro%20pdf
    • http://files.eumindcharity.eu/uploads/1/3/0/9/130969917/duwupelo.pdf
    • http://files.pelletheaterstasmania.com.au/uploads/1/3/0/9/130969001/mozapidoloxusewib.pdf
    • http://files.tribesummer.com/uploads/1/3/1/4/131454221/4002578.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/xejemagixizuwulosizelixum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/36573435668.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/10518668014.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/14202344371.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/sasuvov.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/linux_screen_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/9604/6752/files/70744463464.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/koduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/22561385237.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/benim_hocam_kpss_eitim_bilimleri_soru_bankas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/87719430519.pdf
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/12877402266.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000586b.bin
44cd9ffc97535b9c47c3afe67f8f857ddb025e355538e2d0c765558a928906e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586B 5352 bytes
font_01_sfnt_off00006ab3.bin
8bb518e45b6c78992ecb7645e51d23500bf3f8c76ba391f11f68db9512fc7703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 11544 bytes

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