Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cb3544bd01b5a7…

MALICIOUS

PDF

33.2 KB Created: 2020-08-05 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a989c29b2d748f2eeef748dbab63017d SHA-1: 78af44fcaa57fb6dcbeb24a2b4daf602e997962f SHA-256: f3cb3544bd01b5a7778ab5e978311e01c2e45a8877ebe8e6a55aad5693e8629c
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or scam attempt using a link farm to obscure the malicious destination.

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=pure+imagination+sheet+music+pdf+free
    • http://files.alliesforautism.com/uploads/1/3/2/6/132695278/wukafuvedugonod-xikuruxapuze-pixuwaz-dutimamajuxurop.pdf
    • http://files.sprocket-theatre.com/uploads/1/3/2/8/132816066/94b3b40c.pdf
    • http://files.easygrammar.com/uploads/1/3/1/3/131379738/2671219.pdf
    • http://files.daygroupcompany.com/uploads/1/3/1/6/131606467/4330356.pdf
    • http://files.shieldoffaithaz.org/uploads/1/3/0/9/130969059/c4f7107a5a.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/lalitha_sahasranamam_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/tormented_soul_divinity.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/jirasasujixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/ielts_reading_and_writing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/91125120735.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/31199507309.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/86766985494.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/48208986975.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/snurfle_meiosis_worksheet._answer_key.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_off0000445a.bin
002eecc597fc0006ebeda7bdae10be06872fdf18ef815d71c6512c10105989cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x445A 5540 bytes
font_01_sfnt_off00005707.bin
ac499d5fcf412f9aa48eeaa951f07b88519ea9e2eb40a3e55ac18b4a20cf557f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5707 9656 bytes

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