Malicious PDF — malware analysis report

Static analysis result for SHA-256 395b1da20c08f9fa…

MALICIOUS

PDF

34.8 KB Created: 2020-08-10 08:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5e7cac09f7ef464f5bdf669ba3edd9 SHA-1: 759496d9ce557f2f7ca573752ea62861016ebd13 SHA-256: 395b1da20c08f9faeef3bbbae92fc68c37d6bf665aec3272754dd7cd965e2690
150 Risk Score

Malware Insights

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

The PDF contains a deceptive title and a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, includes the same deceptive title and a URL pointing to a malicious redirector. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or improve SEO for malicious sites. The primary malicious URL is https://ttraff.cc/pify?keyword=english+textbook+9th+grade+pdf, which likely serves as a gateway to further 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.cc/pify?keyword=english+textbook+9th+grade+pdf
    • http://files.the3gs.org/uploads/1/3/1/1/131164081/waduzololu.pdf
    • http://files.martindewittfinearts.com/uploads/1/3/1/8/131856433/lenufi_kixomenixi.pdf
    • http://wirozizon.sailingfrannie.com/uploads/1/3/1/8/131856919/f3237f206e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3750/7240/files/59880304521.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6071/files/kevudu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/morarakibuvopomeno.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/zegotofupu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/97714901134.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/64633149342.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7483/files/sewufepak.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/dujimiduj.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/81283284922.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/soft_tissue_augmentation_principles_and_practice.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_off0000480b.bin
16d6a71084d65ad4e17967de8302754400eb7ccdc2dc3f5d107e89195ef1ef4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480B 5688 bytes
font_01_sfnt_off00005b62.bin
534c1216d133afc37ee731533d49b101ba20588d72cd95023c660bd195e5007a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B62 10256 bytes

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