Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b075193421dc1fe…

MALICIOUS

PDF

51.3 KB Created: 2020-08-12 07:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df41f75a9ff328e1dc9cbe2e5098b50 SHA-1: 2915e74601051a1c165479cf25d5253bd86c342c SHA-256: 0b075193421dc1fea438c9ed1f1be991a2be9f48a6cdb201961c1bacdb159632
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=group+isomorphism+theorems+pdf, reinforcing the redirector finding.

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/pify?keyword=group+isomorphism+theorems+pdf
    • http://files.stdavidandstmair.co.uk/uploads/1/3/0/7/130776081/jowelexe.pdf
    • http://mufuzudil.martinespada.net/uploads/1/3/1/4/131437987/jirebosaxixum.pdf
    • http://files.myvirtualvacations.net/uploads/1/3/0/7/130775971/c907b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/wefusasurarukusopuralin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0678/files/99825656146.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/mumeviw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/hunger_games_3_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/gaketujegez.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/vapufavito.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/brahmastra_by_ajay_gulati.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/51750498305.pdf
    • https://cdn.shopify.com/s/files/1/0430/9352/4637/files/66245891013.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/panuxomisiwadil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab4.bin
961bf71a76e5fc1a8a438615eecc9f7421de1c132f0c79ce8e5d3993fc79dde3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 5068 bytes
font_01_sfnt_off00007bd4.bin
2139fc72b2606828cdf41f0ad5d8dc98d451955cb07b85c3ea31979dd258b930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 14200 bytes
font_02_sfnt_off0000a8a5.bin
a4daabf6f72445e084830ccd59f1b0bc33e600347117e6b298cfdc0fe47d7030		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A5 16752 bytes

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