Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41682a33c3cccc4…

MALICIOUS

PDF

59.8 KB Created: 2020-08-19 23:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8cc4c1b259b104748938bb14c54264e SHA-1: 4e3873b076f568944f081c9d721d855ccc55bad2 SHA-256: b41682a33c3cccc4addb0bd24598eb7ef57c60944f96e58cfe5dc8a638262e8f
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised with a seemingly innocuous keyword related to academic results. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or redirection strategy. The presence of multiple PDF links and a malicious redirector indicates an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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.cc/pify?keyword=psc+marksheet+2018+comilla+board
    • http://files.mutationpennants.com/uploads/1/3/1/4/131453384/subomuzoxob_lomasiteta_tikov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/wigopirukuwutosavisi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/77230480176.pdf
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/rejofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/2456/1829/files/zekaboziv.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7686/files/paduxokarasesuvipuwi.pdf
    • https://cdn.shopify.com/s/files/1/0453/8662/9288/files/bactrias_anaerbias.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/lebiwegazozazi.pdf
    • https://cdn.shopify.com/s/files/1/0451/9854/0949/files/pufevokuximutokut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/54095917644.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b1b.bin
17d7d493e31653eb7278e2d718dfc0810d960d3ac18ade5dd66222215b3c1267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1B 5584 bytes
font_01_sfnt_off00008e07.bin
ec07a66059a4c2c782074d2f0270754fef8f131fad18596804d5ce5bc4ac5086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E07 9980 bytes
font_02_sfnt_off0000ad5f.bin
38c599999837066646e21748ec165b53b685018c2cedbae5061fbc0841fdbb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5F 12008 bytes
font_03_sfnt_off0000d433.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 4324 bytes

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