Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbe6ff033cb6404…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 09:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c29c0e63ef731a4bb993c6f6a743d9a SHA-1: 7d5cc2017f60750a38055abc710db74c72452dae SHA-256: 4bbe6ff033cb640411155c8521a4238e99b6e4a0f10a8241f49d8cf96f4ac62b
150 Risk Score

Malware Insights

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

The PDF contains a link farm of 13 external PDF files, with the primary link directing to a known malicious redirector. The document body itself is heavily obfuscated and contains the malicious redirector URL. This indicates a social engineering attempt to lead the user to malicious content via a series of links.

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=are+avala+naguva+song
    • http://files.eytspartans.org/uploads/1/3/2/8/132814996/fusakupafogureb_rosama_somufivijaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/mathematics_for_computer_science_lehman_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/49435537253.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/momasijipalim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/bonair_evaporative_coolers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/south_america_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/59002340757.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/jarebukupanemegegunojotij.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/ucla_parking_ticket.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/80919713909.pdf
    • https://cdn.shopify.com/s/files/1/0428/1994/4615/files/sheetrock_saw_harbor_freight.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/learning_the_time_zones_world_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/tomato_rt_n66u.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_off00005a20.bin
32100fbba8a48ed9b0bb72c32b2ca3a3bd560569562eb802f2dad79585f19197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A20 4904 bytes
font_01_sfnt_off00006ae3.bin
da247d88ac1cd902f67daf5615ae3cdf1d0a03de59ed1e9b6a291725874a492f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE3 13052 bytes

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