Malicious PDF — malware analysis report

Static analysis result for SHA-256 20af7ff5168d049e…

MALICIOUS

PDF

54.9 KB Created: 2020-08-19 06:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d899fc8f8a6b0a972d1c1aa6363523a2 SHA-1: 7d42abd15a2268dbe87e033f74b9540855bdc60a SHA-256: 20af7ff5168d049ecae05b612716a52dfc1f7a21dcb4db7fdea6f60837458706
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=logical+reasoning+aptitude+questions+pdf
    • http://files.pashminaforme.co.uk/uploads/1/3/1/4/131407511/4211740.pdf
    • http://kerakike.prettytress.com/uploads/1/3/0/8/130813979/5027259.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/beduganulota.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/carlsbad_high_school_physical_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/43294931003.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/21880763387.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/49007382432.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/vuxoxusebomozomag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/kali_linux_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/example_of_application_letter_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.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_off000098b7.bin
665cdbee63df05e088e166b713afcc5b472ede625d11d9a289312bed25852ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B7 5392 bytes
font_01_sfnt_off0000ab16.bin
725ae70f7c28df5831d9cd516accc3bf0c381ebc2ed0d0db4897640478af093b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB16 10444 bytes

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