Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d26bfd767f307f…

MALICIOUS

PDF

72.7 KB Created: 2020-08-27 23:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275143bade7299d1e06eb4935bd4e902 SHA-1: 9b5e18702cba1b8b128a2993f9e7f66dc6e84411 SHA-256: 06d26bfd767f307f80d1fb653104ca4b57e8c2ed533ae1ca419aa3a7613cb2fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are SEO-optimized PDF titles pointing to external sites. One of these links, 'https://ttraff.com/pify?keyword=makhraj+of+arabic+letters+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=makhraj+of+arabic+letters+pdf
    • http://ziriv.houseofreine.com/uploads/1/3/1/0/131070036/devaduxetew-bokefiv.pdf
    • http://dutibefa.thebeaverracing.com/uploads/1/3/1/0/131069934/nodidumasuradebujit.pdf
    • http://files.automature.com/uploads/1/3/2/3/132303082/088c0284a.pdf
    • http://faxud.istanbulsanatlayasam.org/uploads/1/3/1/4/131454215/855119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/gta_san_andreas_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/crema_de_vainilla_artemisa_tellez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5866669006.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/92100462320.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5314/files/gattaca_movie_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7888/files/awesome_god_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/26664974867.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/doxofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/xujubitamikulobosawur.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000e6b9.bin
a9ee1714fc692d09eb50d7a47f68046701aa5112ff4f5e68122b6c9c07004478		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6B9 26388 bytes
font_00_sfnt_off0000a859.bin
31e8a20fd9906ef3fce0837ae2c6b779957f413e208046915c80362875417e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA859 5528 bytes
font_01_sfnt_off0000bb20.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB20 1800 bytes
font_02_sfnt_off0000c3ad.bin
84660f96a421924a90f4bda00e8e5e5266adce74c0585f5e372288214cb17178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AD 10192 bytes

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