Malicious PDF — malware analysis report

Static analysis result for SHA-256 33844e303c7b0efb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 10:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cb02474e7808f9c156c0cc7e66680a SHA-1: 2a26b1499dbafa43edd8164377f063b12748d7dc SHA-256: 33844e303c7b0efb3335464cbbc71bfd218d4b5f232f4dbff2cc0ef23141eda8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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.ru/pify?keyword=appareil+genital+f%25C3%25A9minin+pdf
    • http://files.tracykeencreative.com/uploads/1/3/0/7/130740440/6f2a5ad83.pdf
    • http://files.flvetbehavior.com/uploads/1/3/0/7/130738701/939cc0da.pdf
    • http://pomakozug.larimercountyfop.com/uploads/1/3/0/7/130738993/f5ae95b90f.pdf
    • http://files.dnaleatherwa.com/uploads/1/3/0/8/130873903/7ac51e9274c.pdf
    • https://cdn.shopify.com/s/files/1/0429/8460/3801/files/wufebejojokoda.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/uninstall_windows_8_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/elliptic_curve_cryptography_paper.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/wajufufegobaxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/system_idle_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/1131745341.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1386/files/mine_till_midnight.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/5463338281.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/batukemiremozube.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/61848589490.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/kofanadu.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_off000064f0.bin
e5e76382d8617647f0977223a0fc1e2cca16bb5957c7026fcbaa9cfc66184c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 5312 bytes
font_01_sfnt_off000076ae.bin
141bedda63974ca67a66144299194a91299c3a93045ee181278da18b20a357be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AE 12180 bytes

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