Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9697ed739422393…

MALICIOUS

PDF

54.6 KB Created: 2020-08-12 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 024406aed686e18f5115281d5faa2b5f SHA-1: 63e1e9ecb43a825627916086daada87311edf840 SHA-256: c9697ed73942239342e81ae1507bd42cfeedd474569f1f063cc9f48b574e420f
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=agile%20development%20tutorials%20point%20pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdf
    • http://files.madeleinefinley.com/uploads/1/3/1/4/131454040/kexakuxixeden.pdf
    • http://fatikaj.diamondlodge83.com/uploads/1/3/0/9/130969742/2381517.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/47832824525.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/blood_dk_bis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/fipukuditozimorepobatele.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/71704738596.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/sebakez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/coin_sorter_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0673/files/factorizacion_trinomio_cuadrado_perfecto.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/86938715361.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/39178780766.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/zubadupew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7656/files/25818887777.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/wojorofuvivubatuwa.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_off00009790.bin
ede43a19614e770a4d0b59d037cc3c216baa8db947cff0e73cd32ffc78db9cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9790 5412 bytes
font_01_sfnt_off0000a9e8.bin
0c40e623e9dccda84184c59ab043556ebc2e79f231a0267e09db4df4a7dc59e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E8 10372 bytes

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