Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe78f3efb5528400…

MALICIOUS

PDF

81.1 KB Created: 2020-07-31 03:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00af7e90ab8f696113345f67a16ac77c SHA-1: dc6678062bde67fdb65a25569aa1824c2cf719fc SHA-256: fe78f3efb55284007090aa97216c1345492b0027041ca653db876966c77675a6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious due to its use of a link farm, which directs users to a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure for downloading a book, likely a social engineering tactic to drive traffic to malicious sites. The primary IOC is the redirector URL, which is part of a known malicious infrastructure.

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=cahills+vs+vespers+book+4+pdf+free+download
    • http://files.kobanuniverse.net/uploads/1/3/0/8/130814157/7765113.pdf
    • http://files.heywoodracing.com/uploads/1/3/0/8/130814209/fisekonawefifuvoke.pdf
    • http://files.corsettiparalegal.com/uploads/1/3/1/8/131857419/b1385f01279c40e.pdf
    • http://files.marketmovesmatt.com/uploads/1/3/1/4/131438784/tizukir_fovizesuvirediv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/kuwujamuxakopokonubopewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/fosagezarebanisiladukuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/mitubotozemajage.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/jezuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/38105080031.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/75887564082.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/53207297829.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/sorumapifasomagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/jetomij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/wujanefipemupir.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_off00010056.bin
b02500e81a95dbda171c86683d56cbe9b816483bc6d6934432d2c79604664d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 5304 bytes
font_01_sfnt_off00011263.bin
e0cd6b4947c0e74e563a77562295b287db6067b6298ea6502c351f276e2478a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10512 bytes

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