Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2815c8bdcec5c8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-16 21:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42feb0afd6d61d7d9cfe0111f7e3fa7a SHA-1: 3120ba8460d305f077438e910acb6137f84f80a4 SHA-256: 3d2815c8bdcec5c82f4b92ee5e2275da5b0d5ae2dff8dd6ce73f9eb8f2423e19
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=graphing+inequalities+in+2+variables+worksheet', is designed to lure users to a malicious site. The file also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary intent appears to be directing users to malicious infrastructure via the redirector.

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.cc/pify?keyword=graphing+inequalities+in+2+variables+worksheet
    • http://files.okcwriters.org/uploads/1/3/0/7/130776823/e3a6674b2cfcf72.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/50396139760.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/88319812720.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/mafuvikuxukamafugom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/78230883448.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/symbolic_logic.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/luwapawuvemutesopusojelod.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/75035180720.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7835/files/nopivinoridatezumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7692/files/11205802536.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/lukeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/bopiwibodabewaketunimud.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_off00006452.bin
ed8167e13d3619926f05048c0eea38de67e9c2f08d09100016ea1861d938b47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 5724 bytes
font_01_sfnt_off000077e6.bin
2017edfc5e0ff9d1dbfc05e28f00ff82cff2730e0627ccdfd80f8db6984b1bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 10032 bytes

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