Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3839685f0682ce5…

MALICIOUS

PDF

34.2 KB Created: 2020-08-21 16:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b06b94d208cc5467b4f525720cc158f7 SHA-1: 5109f68d82721923d82207253eced7b2ad7d400a SHA-256: f3839685f0682ce53505ea29b1ac8e8ca72516041fc13feee80e7684bf5689e8
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a seemingly benign search query. The PDF also contains a large number of external links, many of which point to PDFs hosted on Shopify, likely as part of a link farm to improve SEO for 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/pify?keyword=formal+beach+dresses+canada
    • http://vogekutux.nankanhoc.com/uploads/1/3/2/3/132303382/wotagopiro_foruvalasi_wuritovulex.pdf
    • http://files.colorbychris.com/uploads/1/3/1/4/131437848/323d1396.pdf
    • http://kufobe.claudiariverotv.com/uploads/1/3/0/7/130776031/68ede8ba63.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/cognitive_theory_of_language_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/noun_phrase_and_noun_clause.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/tolexo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/tudun.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/brightburn_movie_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4768/1191/files/kozulapoxuso.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/microsoft_outlook_e-_newsletter_templates.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/jafemajajawewokigase.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_off00004826.bin
03f081f79740191bfb601edefd0c3cd573a923ac735d58e0062b7734b9b803c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4826 5272 bytes
font_01_sfnt_off000059ea.bin
699cbdb2eb4f8eb069b33dadad736a2951b5673e5a99b315ccc62e7e339e2191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EA 10160 bytes

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