Malicious PDF — malware analysis report

Static analysis result for SHA-256 d833147e0f9b17e3…

MALICIOUS

PDF

37.4 KB Created: 2020-08-12 06:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f560053236f34d505afc8cbfdf49c3c SHA-1: 7282159659549edf661bf17d62ce93e72c2a9ca9 SHA-256: d833147e0f9b17e3328e646961826c5b43bc44de58f99cb445cfffd73e9a79a3
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to ttraff.com. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a transcription practice worksheet. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt to distribute malicious content.

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=transcription%20practice%20worksheet%20answers
    • http://files.grandbendsoccer.ca/uploads/1/3/1/8/131871894/mirelukexuger.pdf
    • http://files.kateloganbeauty.com/uploads/1/3/0/7/130775665/611302e.pdf
    • http://kokofe.hoodoohealing.net/uploads/1/3/1/4/131483138/5220074.pdf
    • http://files.isme-conferences.org/uploads/1/3/0/7/130775707/nuteketatos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/temuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/83230606053.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/litovezekowureka.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/dictionary_of_civil_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/pagapogodirilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/88767781706.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/anti_arthritic_activity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/dijunom.pdf
    • https://cdn.shopify.com/s/files/1/0429/2437/6227/files/abcd_malayalam_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.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_off0000567e.bin
c558b26ffe20df555d75bfe2a8e0c0bb41dd58aa17a0b2276bd02352777e5f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567E 5096 bytes
font_01_sfnt_off000067d5.bin
5dd6321217d31ea6b59bf2d5235cd45d9ed2f4ce6e7b0390ab6a649e51a04a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 9644 bytes

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