Malicious PDF — malware analysis report

Static analysis result for SHA-256 7648ceb24e495b86…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 21:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cbcdbab42fed47fd31c1d98d7f06b27 SHA-1: cfc02862352b1f235214f479062d8ca74ee1fe83 SHA-256: 7648ceb24e495b86e9217fb0fc703f6a0d0732b2fa852d8fb154d99635ce83f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=motu+patlu+games+free+download'. The document body, though heavily obfuscated, contains references to 'motu patlu games free download' and the URL, indicating a lure for free game downloads. The presence of embedded URLs and the ML classifier's high confidence score support 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.cc/wix?keyword=motu+patlu+games+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3846/6460/files/babua_kahela_rota_hai_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/danure.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/xegipukezifosenixazixirir.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/seranopafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5982/files/mijaxak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/mibenokido.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/uniden_bc125at_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/86242745775.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/rorulodaxudoj.pdf
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/brief_creativo_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8097/files/cease_and_desist_letter_uk.pdf
    • https://cdn.shopify.com/s/files/1/0444/5034/9223/files/86753058969.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/scrambled_sentences_exercises_for_beginners.pdf
    • https://static.usrfiles.com/ugd/b5472a_58625fc22428455285b9c4fc0a8971b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad9eae7bcf3b4f189219a120b63a11f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c18c34ad10884e728dd5f90b0d3ff43b.pdf
    • https://static.usrfiles.com/ugd/599026_c989e2a98fb1456bb720a5d598b35c04.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b52.bin
138b532cb51e2e7a8965133bef1ddc57a32bd1019a6259c8bdcb09297907730c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B52 5460 bytes
font_01_sfnt_off00005deb.bin
4efa8706d912537f71c5ea50c481a45b72126dbca8bfb7e94c1e2a3736fd09db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEB 9824 bytes

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