Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce0f8f5d56d45f…

MALICIOUS

PDF

65.3 KB Created: 2020-08-07 03:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e90a2a5b078c5e301d655bc8349c2f SHA-1: af25de1d4747b3aabfc9391dc3dfa9a64d49f7e3 SHA-256: 21ce0f8f5d56d45f84a0fd957dcd750ebac27e15d98974f1609d18ed2cad8ea8
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about Albert Bandura's social cognitive theory. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the link leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a larger scheme to generate traffic through numerous external links. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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=albert+bandura+social+cognitive+theory+pdf
    • http://temajed.capitaoericeira.com/uploads/1/3/1/6/131636725/lafaxolixebonisagono.pdf
    • http://files.garjones.com.au/uploads/1/3/1/4/131437319/vituferelawaze.pdf
    • http://files.wargametransfers.com/uploads/1/3/0/7/130740591/cd0d36d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/philips_universal_remote_cl034_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/6305291497.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/25126703484.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/51924903893.pdf
    • https://cdn.shopify.com/s/files/1/0436/6155/7913/files/26375385454.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/rarobekokisewidomat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/10676317846.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/94196779639.pdf
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/88264231752.pdf
    • https://cdn.shopify.com/s/files/1/0440/8888/5413/files/96766301328.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_off0000c1a9.bin
6498c392bc61350df8aea0011ce3dbba0e88df163d484132525027d4e35b0738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 5708 bytes
font_01_sfnt_off0000d51f.bin
6ece7a73d0a5e651dda9a4778dc8ea37f3cc3326783ecae641dd34e4107315d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 10176 bytes

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