Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae73092e3f1fb40…

MALICIOUS

PDF

41.0 KB Created: 2020-08-04 23:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b4c27b14a575b7a44d10246017d2a1c SHA-1: d6643f41b613491a534c2577e1fae5e5db0b46f0 SHA-256: 7ae73092e3f1fb40061bdf46f7e2375fecbc4abc45734fcc9872c25830bdbcc9
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO link farms and redirector schemes. One prominent URL, https://ttraff.com/pify?keyword=linear+and+nonlinear+functional+analysis+with+applications+ciarlet+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious links within seemingly legitimate content. The presence of many Shopify-hosted PDF links further supports the link farm heuristic.

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=linear+and+nonlinear+functional+analysis+with+applications+ciarlet+pdf
    • http://lelejebe.suzannakrivulskaya.com/uploads/1/3/0/9/130969368/2981896.pdf
    • http://files.mavensmarket.com/uploads/1/3/1/3/131381046/990800.pdf
    • http://files.endoyoga.com/uploads/1/3/1/8/131871643/mubafof.pdf
    • http://files.leaderscalltoadventure.com/uploads/1/3/0/7/130739032/xiwotabukova.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/napiseruf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18608783112.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/munakupatabasupevibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6498/files/wojebuxigotepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/bizowajuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/96960695325.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/55389179999.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/fiwosafukeloju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/34976783764.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/fotixoregozimezirulagagi.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_off00005f61.bin
5018330ad7b7eb55774985b12f60cdbf30e81444e59d5b8d0ff35b36c1a4036a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F61 5376 bytes
font_01_sfnt_off000071cc.bin
09f542aa5442096bb1fb3f2a1b5a4317fc8cd8150d12e66713655469a7950b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CC 10824 bytes

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