Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f90a1331e44f30f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 00:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010b8150c3fb2c8cffcaf2acd8696c68 SHA-1: d31dbaaa2914d57a42995bc60705e752c8b7b376 SHA-256: 1f90a1331e44f30fd57a7367d0dccc56808475e2a1311ee13cd5f25084e0eaef
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', which is used to lure users with a fake download. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The presence of numerous external links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=english+speaking+in+marathi+pdf+free+download
    • http://files.sallychinea.com/uploads/1/3/0/7/130740524/cf4ee67.pdf
    • http://dariwaw.getmeintouni.com/uploads/1/3/0/8/130813612/fafalifokamolekosul.pdf
    • http://files.learningladderduxburyvt.net/uploads/1/3/1/4/131406688/nugozafopa_bobowo_simexosat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/jovawuwusik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/6713465299.pdf
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/56123832094.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/zafumujetalogamopebazas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/10898809527.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/pibivutadokutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81397135942.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/gakefovizajewopopep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/mibizezekej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4732/9702/files/43632007222.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/the_tragedy_of_cambodian_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0822/files/radowemib.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_off00004d6a.bin
7171ca0d0c62f59b733385071ea07e7f34d92c9e6d365649c6976c6d52040870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6A 5568 bytes
font_01_sfnt_off00006040.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 1936 bytes
font_02_sfnt_off0000697f.bin
e59ff3270a15bc51e3225197c0bcd26f35b9a7f409cbfb19d0e743150f30fd05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697F 10396 bytes
font_03_sfnt_off00008d33.bin
db93215632e8215dd759d2286647e6c0befb97eba34f9587af4da41226f79357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D33 17164 bytes

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