Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c60c71935f5761c…

MALICIOUS

PDF

52.0 KB Created: 2020-07-30 09:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8cc84b663c807d2940d04ef9df71765 SHA-1: 538bbce1e904326e3ce43cfc3f3eda720e0294b0 SHA-256: 4c60c71935f5761c52200307a6a1db3d8ab13b628927fa7b4dd054582f175fc3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised with a seemingly relevant keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain text related to the lure. The primary attack vector is a user being tricked into clicking the embedded malicious URL.

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=que+es+aneurisma+cerebral+pdf
    • http://files.hungryhawaiian.net/uploads/1/3/0/7/130776326/6531294.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.walk-cards.com/uploads/1/3/1/3/131398253/kilapozofotede.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/buvewine.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/90842564668.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/78656799620.pdf
    • https://cdn.shopify.com/s/files/1/0429/3463/2607/files/24712618249.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/falaxamuluwikemeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/zikuwekudagefenenukuxewa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/pidam.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/diwekumukem.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/71211125732.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/16148428719.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/patutubepozopusila.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/21025463754.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/44334877852.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/79533824331.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_off00008fb2.bin
55eeadcbcc4a83cfe9178c0d535a507075b46e8d578256c446a5ca8221907033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB2 5192 bytes
font_01_sfnt_off0000a125.bin
4610de5bce88492e3dfad5eac9ea04797546d9f5135d310dfc14979ac23f7288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA125 9812 bytes

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