Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b788221ac5cb21…

MALICIOUS

PDF

47.5 KB Created: 2020-08-16 23:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6eac2d31911a0d0e43a7b1c7a00ed7f SHA-1: c8241b1f061fbe63562f6c5eabe0ed33e1e52e0e SHA-256: f6b788221ac5cb2114ffc00464997d9d1546de0eb2de0edb33a285b1d0926c50
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Yahoo answers mental health' and the malicious URL, suggesting a lure to a phishing or scam page. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination and potentially leverage benign-looking domains for malicious purposes.

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=yahoo+answers+mental+health
    • http://sateribuv.twicesmitten-us.com/uploads/1/3/2/6/132682646/wozerelimiru.pdf
    • http://files.artspace613.org/uploads/1/3/1/0/131070689/niwalo.pdf
    • http://files.fivepointhorsetraining.com/uploads/1/3/0/7/130776483/3653087.pdf
    • http://files.pastorhurmon.com/uploads/1/3/0/7/130775840/lamorinozapan.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/xbox_360_games_iso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/68433555964.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/34005710174.pdf
    • https://cdn.shopify.com/s/files/1/0437/8404/4705/files/92064980525.pdf
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/suvukezal.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/bezivubufote.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/anagyris_foetida.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1889/files/calvin_and_hobbes.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/4e_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2794/files/38131494565.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/99894433373.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_off00007c93.bin
4b1540b44f81662ec3271a207f3b24da915c9679d32f26015b06faf5ae65f3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C93 4976 bytes
font_01_sfnt_off00008d64.bin
7a0821ae31404a3c8b80b37e1565b24e03fd3a8bede44bb10ae63e9b629f4400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D64 10340 bytes

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