Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78bda261bf7e328…

MALICIOUS

PDF

53.4 KB Created: 2020-08-22 17:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7387166df94004840cd6b5cb68d3a88a SHA-1: eba077c65f12e0d37dc14faabce2a76bbe55bdac SHA-256: f78bda261bf7e328d282fce5150f338b565a2898c3286641c9cb9a212e11f115
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to academic results and the wkhtmltopdf tool, indicating a lure to disguise malicious links as legitimate search results. The primary intent appears to be redirecting users to malicious infrastructure via these links.

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=jac+board+result+2019+class+8
    • http://files.academy44.com/uploads/1/3/1/3/131381363/8095530.pdf
    • http://suwanezu.glassmanneuropsychology.com/uploads/1/3/0/8/130874085/28b68de280.pdf
    • http://files.pumpkinmoon.net/uploads/1/3/1/3/131379552/banug.pdf
    • http://mopuzonaj.pickleballhouston.com/uploads/1/3/0/7/130775451/262801.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/bojujurulitokizolodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/44596406758.pdf
    • https://cdn.shopify.com/s/files/1/0434/3676/9447/files/ncaa_division_1_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/49340052242.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/46057088853.pdf
    • https://cdn.shopify.com/s/files/1/0445/6969/0276/files/anatomy_and_physiology_of_the_human_heart.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/vapekarakokabex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/48343595190.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/64964202465.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/gasigigipuzodusasijuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/bixarupeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/free_blueprint_maker.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b8.bin
6c46035fdb0ca3ddf903b7206778eaaa3e7fb7a9c762fd7305540c43620eafef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 5740 bytes
font_01_sfnt_off0000793c.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 3720 bytes
font_02_sfnt_off00008496.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8496 1936 bytes
font_03_sfnt_off00008dd9.bin
edf91f10433c934fa566409062871083d965a69e38a936f689695bf731faecca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD9 10748 bytes
font_04_sfnt_off0000b2c8.bin
1181290d99edd457d5960ab23d99d061168c55f7b88fac1727f9261ebd206716		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 5876 bytes

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