Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7917405eee1170a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 00:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016dff10a00465f2ebe08b87767362ab SHA-1: 8019fbc956a05efa011c22f2287655132357cd0d SHA-256: a7917405eee1170afe5b2f3ca632a02b1bd8652776538c90c10ff5bb23ba9c0b
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF download, which aligns with the malicious redirector's purpose. The presence of a link farm heuristic further indicates a malicious intent to drive traffic to potentially harmful sites.

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=collins+vocabulary+for+ielts+pdf+free+download
    • http://files.pandora-pilgrim.com/uploads/1/3/1/4/131438786/zimisamut.pdf
    • http://files.alaskafoodie.info/uploads/1/3/1/4/131437725/6334135.pdf
    • http://files.nickboyweddingvideo.co.uk/uploads/1/3/1/3/131398188/lupanubugeza.pdf
    • http://files.sculptedroots.com/uploads/1/3/0/7/130775223/gizekunosututik.pdf
    • http://files.stockela.com/uploads/1/3/1/4/131407921/mudego-tobolaros-sotiref-ruxene.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/islamic_calendar_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3616/files/3158898032.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/40895075940.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/59621154166.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/87737623952.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/18818734952.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/17802284915.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/48424414915.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/vorajavif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/85343303956.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_off00006e1c.bin
7411f6c7d52dfb02b0789ec69440e56536df76803848a069b22a231f0c0f6e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 5448 bytes
font_01_sfnt_off000080c5.bin
b6b11c7c4c0f6e68237211123fa5c3db692146e2f5a046414e4add9a5f50b43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 9756 bytes

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