Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9be4439c1c5f2f9…

MALICIOUS

PDF

47.4 KB Created: 2020-09-05 03:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24f3d095b4f5509a842cd8df2212f5c SHA-1: bf81baa0c42f7b98d5c4e675b4dda5e7853d1c7a SHA-256: d9be4439c1c5f2f967b5c0738db3ac94a34ff6c38158f233fec1ae3de16e8ad6
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. The primary malicious URL identified is ttraff.club, which is used in conjunction with a keyword that mimics a legitimate document title to lure users. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, suggesting a social engineering attempt to drive traffic to a malicious site.

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.club/wix?keyword=autosar+layered+software+architecture+pdf
    • https://cdn.shopify.com/s/files/1/0448/1869/4305/files/66734283797.pdf
    • https://cdn.shopify.com/s/files/1/0438/1261/8402/files/font_buttercup_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/23831614985.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2661/files/toyota_yaris_2020_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/interview_guide_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/number_of_islands_ii.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibuzos.pdf
    • https://static.usrfiles.com/ugd/cc15ef_ae050df5dafb465bbb41e55e9b8f8d78.pdf
    • https://static.usrfiles.com/ugd/9f2514_3ca62deefcc9428d9d27b53948cd3930.pdf
    • https://static.usrfiles.com/ugd/15d534_75a7c66acfad485894b7a251a35613ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e2a167026e041c4b80dfde2865d0e21.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_off00007bef.bin
dba663d8029f8691b96a8fec40a12e9d1a19f82e87933722e4716ee1346db820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEF 5424 bytes
font_01_sfnt_off00008e7b.bin
d067f98752a0b78aa14bea76a52ce6e2b01762b239c3dce1423ed75caa5123d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7B 9980 bytes

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