PDF malware analysis — malicious · b054731c8ebc6abf

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 22:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ad22c0fd797c71b3ef3548e5dfccb0da SHA-1: 91b0d544d07609174f0896cc6edc5a744f549d4d SHA-256: b054731c8ebc6abf3aad6d13926e8491df7d4b036b063ab06a764edd59c2194a

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily corrupted, contains text fragments that appear to be related to a datasheet, suggesting a lure. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to obscure the malicious redirector or to appear as a legitimate document repository. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=atmega328p+datasheet+sparkfun
- https://static.usrfiles.com/ugd/b8c837_0d92b88587ee450aaaa20a7ded358862.pdf
- https://static.usrfiles.com/ugd/04c368_d1e43b390a3c442983e997df2f3aebf1.pdf
- https://static.usrfiles.com/ugd/136d07_9ad11210940046c7b0996a05d235380c.pdf
- https://cdn.shopify.com/s/files/1/0431/7518/2485/files/adding_and_subtracting_integers_practice_7th_grade.pdf
- https://static.usrfiles.com/ugd/67f5f7_bab57f8427c1455db9a391a1ab81c414.pdf
- https://static.usrfiles.com/ugd/ef7b09_730c72ddead3424e974508e7aacb7ef0.pdf
- https://static.usrfiles.com/ugd/09273f_6660d370e44749b383f36961fd8a7084.pdf
- https://static.usrfiles.com/ugd/b8c837_c6ad5c6885594950ac3b8735acf93018.pdf
- https://cdn.shopify.com/s/files/1/0434/8585/5897/files/axa_france_guidewire.pdf
- https://cdn.shopify.com/s/files/1/0431/6754/7552/files/wudemegix.pdf
- https://cdn.shopify.com/s/files/1/0432/3295/2477/files/hygiene_and_food_safety.pdf
- https://cdn.shopify.com/s/files/1/0428/9665/4489/files/rexijiwipumawa.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000048f3.bin` `337e9a60fba41f26ced79656ddd0c9023dbf2bcda075a5722ca6e9964b9e3fe2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x48F3	5692 bytes
`font_01_sfnt_off00005c22.bin` `54b5d31ee24b0d4b84d381075c2908d39c23753b29b4a110c0dc75283fb1d796`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C22	13240 bytes
`font_02_sfnt_off0000867e.bin` `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x867E	4324 bytes

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