Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b42efed90d94bfa…

MALICIOUS

PDF

69.0 KB Created: 2020-07-30 06:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b8ded5ef6e3f9cbc5a7d59bcf61caa3 SHA-1: b70786b5497f44923800acfdbdcc567656769463 SHA-256: 4b42efed90d94bfa308dc33492122393b3aef6417c4fe226cd6d696cd452c0c1
128 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.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'English grammar tenses in telugu pdf' and mentions 'wkhtmltopdf', suggesting a lure document. The presence of a download button heuristic further supports the malicious intent of directing users to external content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=english+grammar+tenses+in+telugu+pdf
    • http://files.danielleaugustine.com/uploads/1/3/0/7/130739415/b09370cde2a4a.pdf
    • http://files.halifaxinternalmedicine.com/uploads/1/3/2/7/132740586/bb72eae86c0a05.pdf
    • http://files.donkeycar.com/uploads/1/3/2/7/132741144/9c3630.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/dexelotakimodawiwarojinud.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/83925000702.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/19475954405.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/4193085803.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/6520054811.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/poxusulijupidokubeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/80922349295.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/76870110231.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/funowukuniremokane.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.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_off000078b8.bin
dd0e64fce07eb4f861db2cd926ea30a176cc39b23980c945d9ff9d0181fd206e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 5184 bytes
font_01_sfnt_off00008a20.bin
1b6b855f4d2392408a267c0e84f82a2410a98b263566214d59ac7f4f6fec7cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 26180 bytes
font_02_sfnt_off0000c30d.bin
b2252738052d5dd280ae4137c00d5b7641f67cdb116fdd667f62f2c17e0ab39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 14392 bytes
font_03_sfnt_off0000eff0.bin
fb068303513e190bf9749f839f86096b33321690f561e07e727c9816c30dc8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16312 bytes

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