Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a6c873cc1736ed…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 00:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc9b8f501865d2631674df7c55696b1 SHA-1: cc7cd561efd60e5b61693c4e271a8812782dcb57 SHA-256: c8a6c873cc1736edd3898938e894582d5e89e8f1becf7bf7e07261b3b0ab6cd3
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 the target URL, suggesting a lure to external malicious content. The presence of a link farm heuristic further indicates an attempt to distribute malicious 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.com/pify?keyword=gramatyka+angielski+gimnazjum+pdf
    • http://dufomab.jsmountainpondfarm.com/uploads/1/3/1/6/131636664/0f5e52.pdf
    • http://fadirim.yasminearrington.com/uploads/1/3/0/7/130776823/4297428.pdf
    • http://files.charlietaylorphotography.com/uploads/1/3/0/8/130814682/5271060.pdf
    • https://cdn.shopify.com/s/files/1/0434/6675/2164/files/rujifuzil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/19841369008.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/box_orbital_notation_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/lijaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/2471/7723/files/dijif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/zikowonenefojuxigizirogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/23125574387.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/49285038456.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/niriku.pdf
    • https://cdn.shopify.com/s/files/1/0437/0982/5174/files/xunotuxagexinap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/vuvurumali.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/xobitodalotago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0b.bin
e04a4c2b774359e0e9da670dfcb990e85b1c634605189809b3b6ea0122f67b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 5456 bytes
font_01_sfnt_off0000719d.bin
94cdc0be1130fe4074bba8e048da622f571ddfab62bd7e388283b56b99369501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719D 11272 bytes
font_02_sfnt_off0000957f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957F 4324 bytes

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