Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79db129cf8c8d1f…

MALICIOUS

PDF

41.9 KB Created: 2020-07-08 19:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576652a08955b4a3b4d8db7463b3c37b SHA-1: 854048ccf7db829918eaac2c2442fff8175e46d6 SHA-256: c79db129cf8c8d1f8c2ff4d2237ba266cd636e5c035f97518d7f7ddc15f4f683
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and appear to be part of a link farm designed for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the same suspicious URL found in the heuristics, reinforcing the malicious intent. No scripts were extracted from this sample.

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/wb?keyword=housecroft%20sharpe%20quimica%20inorganica%20pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.britefulbiz.com/uploads/1/3/0/9/130969718/jelab.pdf
    • http://files.elevenbees.com/uploads/1/3/1/3/131398281/mitatito-namat-fovexenopekomig-lusuxa.pdf
    • http://files.enfieldjolf.org/uploads/1/3/1/1/131164418/bigebovonozi.pdf
    • http://files.zoepantinjewelry.com/uploads/1/3/1/4/131406433/tilirovog_fibamujuv.pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://files.focusedlearningsolutions.com/uploads/1/3/1/6/131636990/49d8e9.pdf
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • http://files.victoriacoombsbowen.com/uploads/1/3/0/9/130969485/0f6847.pdf
    • https://pixudefixig.files.wordpress.com/2020/06/53593868462.pdf
    • https://wifuxew.files.wordpress.com/2020/06/mufodo.pdf
    • https://taxoloxud.files.wordpress.com/2020/06/vekajoledesiluzufoxapod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.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_off00006451.bin
8b0b8a18c674afbe88e737ce059715a31c63c68b853fd25d7dab0e6b14fc1022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5508 bytes
font_01_sfnt_off000076dd.bin
36034294ad8e3508146fb9a21c0e8cb259b63f57ff84c1600e7bef81e507b2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 10404 bytes

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