Malicious PDF — malware analysis report

Static analysis result for SHA-256 722a76188331bf60…

MALICIOUS

PDF

53.0 KB Created: 2020-08-26 02:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f8d96573bd7fef73ca223c90e1891a5 SHA-1: 71545a032055a0f63d6ac89af58ceb9b42a73af3 SHA-256: 722a76188331bf609cc8f8b352ec0da74097373bd3651cfab5526c8409871366
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=how+to+change+biome+with+worldedit
    • http://temiwe.susanmiillerart.com/uploads/1/3/1/1/131164239/2275916.pdf
    • http://files.amaxdesigns.com/uploads/1/3/0/7/130739444/numupijorisawatemole.pdf
    • http://files.forgottensheep.net/uploads/1/3/0/9/130968988/8721569.pdf
    • http://pusipaja.stjohnpreschools.com/uploads/1/3/1/1/131164250/gagufuxetitozemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/30604522213.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/xexirebaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/gevuxuwikadik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/91877082011.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/gotir.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/mirebatijanusu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9247/4011/files/85767438131.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089ff.bin
5a2c05c60808b8e596736ce0eab49ad8b13ebff8adc0240a40fde251a7036386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 5368 bytes
font_01_sfnt_off00009c18.bin
0c50e6f76ea0f3785bdac8a1957ad30105f0a28cccb40639bc22b6db901b4475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C18 14056 bytes

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