Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cad8a80cb177126…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa733ea130c04ba24ee65302a655c823 SHA-1: 0c68bf113e30e7a15c0465b09ea072ee2b560bca SHA-256: 0cad8a80cb17712626e9d948233e724fba5437c0f1d4442145caddd88dbd6a14
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'how to make a shop in roblox studio 2019'. This link redirects to a known malicious domain, suggesting an attempt to lead the user to a malicious site or download. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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=how+to+make+a+shop+in+roblox+studio+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3031/3122/files/tunaselesobagijiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/logekunogivevojuwapevi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/analise_sintatica_exercicios_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/12914427325.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/reluwugapukeketole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/gofijobajepawu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/drown_bring_me_the_horizon_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/6516/4454/files/candidiasis_oral_lactantes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/burozofeloko.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bde1bf4d48645b9821b20ead62ea58b.pdf
    • https://static.usrfiles.com/ugd/b8c837_958296bf50a54ab59f4d998d3d98c7f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2cebcae217b434ea6de0aeef9b1e0b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_590b5e65201b431d8452dcceb3ed0810.pdf
    • https://static.usrfiles.com/ugd/1e32c2_152e3f4946c44f509effdf2284c884c1.pdf
    • https://static.usrfiles.com/ugd/73c254_4f27149efa114091be1011b5d5da27d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd42a04372244f6ebda7c661517b79c7.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_off000061b2.bin
d3e78ff56f8b88be7581dbfbf69953fc4d554eba891707ee2c6a66e8bd99cf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 6008 bytes
font_01_sfnt_off000075fd.bin
35ad4d9c6d43014e8937656e0fa1c21d76bd6d898f5bc3dfe2bf63c83efdd4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 10128 bytes

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