PDF malware analysis — malicious · ddc023fa1daf60b8

MALICIOUS

PDF

54.9 KB Created: 2020-09-02 18:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c336af9d6af6c6eeac7c9c59555cdecc SHA-1: f6638fbc0ae94f25dd0c52919f03c06f0a9f1879 SHA-256: ddc023fa1daf60b8843303a4473c3fee5a534803f62ce73d5c568859d121164c

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.link, which is disguised as an academic worksheet. The document body, though heavily obfuscated, contains the same lure text and URLs. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. The primary attack vector appears to be social engineering through a deceptive document.

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.link/wix?keyword=epsilon+delta+definition+of+limit+worksheet
- https://static.usrfiles.com/ugd/90c678_b260bb6584174582b5791af14f79ea95.pdf
- https://static.usrfiles.com/ugd/0779a3_2cf08e28492e4d48855f05abe9d9d102.pdf
- https://static.usrfiles.com/ugd/b8c837_607fbfb1d5f645238b825f8f09e0339f.pdf
- https://static.usrfiles.com/ugd/b8c837_439e1fefe93744659e27b060ebe7e964.pdf
- https://static.usrfiles.com/ugd/724bd4_4e98e7457d6645e0a7bb48d6e2de527a.pdf
- https://static.usrfiles.com/ugd/f67134_fc52ae33a88649cc8381e34f8ba95743.pdf
- https://static.usrfiles.com/ugd/041b56_9d6fd40e51bb4a5588b847df1aa3cc20.pdf
- https://static.usrfiles.com/ugd/89c6ad_8b567c9728c84205bdaa855a31a384cf.pdf
- https://cdn.shopify.com/s/files/1/0429/1713/4502/files/pip_camera_photo_effect.pdf
- https://cdn.shopify.com/s/files/1/0429/5468/6630/files/basic_electronics_books_free_download_in_tamil.pdf
- https://cdn.shopify.com/s/files/1/0435/3481/1290/files/ade_date_sheet_2019_aiou.pdf
- https://cdn.shopify.com/s/files/1/0432/2171/3060/files/appraising_and_rewarding_performance.pdf
- https://static.usrfiles.com/ugd/7d21c0_c04dc7fcc06b4c24a990bb749aa12541.pdf
- https://static.usrfiles.com/ugd/08fe48_dc883669bf5d4e4f81edccdb4a0aa5fe.pdf
- https://static.usrfiles.com/ugd/77941b_6b8b877b429c4eabbe20e1142f78f57a.pdf
- https://static.usrfiles.com/ugd/b8c837_cc57052941664a6e85045ed2ea64d616.pdf
- https://static.usrfiles.com/ugd/565485_01fc219348f04f839d9895ba3fe16613.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00008a6b.bin` `d63627df30d3e32520eb88e7bd9adaaf9a4c983bcdd0427eccb0edeef7ec4f0b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A6B	5392 bytes
`font_01_sfnt_off00009cac.bin` `b1a64bc2d80a01dd37e207a9d24b4867f35bc6333682c152c79b6049586e3130`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CAC	15940 bytes

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