Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cac161919fb4851…

MALICIOUS

PDF

44.6 KB Created: 2020-10-08 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51f05629ae2d81288583cb9f8a79677 SHA-1: 5feccd954dbbbc0d90c37115676d071cbf47a312 SHA-256: 7cac161919fb4851be2aae0a23686aeabcfe1368b723b4a36b86dcb6108614fd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to potentially malicious redirectors. One such link, 'https://ttraff.me/pify?keyword=twitch+on+roku+stick', is explicitly flagged as a redirector. The document body, though heavily obfuscated, contains a similar URL, suggesting the primary purpose is to direct users to external, potentially harmful, content.

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.me/pify?keyword=twitch+on+roku+stick
    • http://files.centerpointcoaching.com/uploads/1/3/1/4/131437668/vexotet.pdf
    • http://files.sallyjcurtis.co.uk/uploads/1/3/1/4/131437655/rewenefogo.pdf
    • http://koguvavo.melindaaimeephotography.com/uploads/1/3/2/3/132303079/7934191.pdf
    • http://files.artworkbynate.com/uploads/1/3/1/0/131069923/2080292.pdf
    • http://tezeja.district2nyc.org/uploads/1/3/1/1/131163777/a7d07405a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97558e87-439d-4e4c-9c82-e55dfeff1112/42703866705.pdf
    • https://uploads.strikinglycdn.com/files/4416e8dd-6c0a-4c1e-b909-839351c9319e/98437967008.pdf
    • https://uploads.strikinglycdn.com/files/10fcafce-780b-4976-9388-18b3c3e148e4/31956873789.pdf
    • https://uploads.strikinglycdn.com/files/3b21213e-76b5-4096-8f15-54b97c1ea0b2/xemewa.pdf
    • https://uploads.strikinglycdn.com/files/45cd6369-1bd2-444e-9410-7658c22aedc7/jiluwunebagevatew.pdf
    • https://uploads.strikinglycdn.com/files/23aea330-6936-4a46-99fc-a6d29526b2f0/pimixomodojom.pdf
    • https://uploads.strikinglycdn.com/files/8b9745d5-d513-4fd2-bc67-3b7085ea7fe2/98906254432.pdf
    • https://uploads.strikinglycdn.com/files/396464b9-781f-42dc-8eba-4a3447cdfe2b/28749088173.pdf
    • https://uploads.strikinglycdn.com/files/930afa5d-3801-456c-93f5-f2be6df40208/97445173901.pdf
    • https://uploads.strikinglycdn.com/files/708f09c0-ca60-439c-9097-4f4ef560e24f/84286169967.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_off000071e9.bin
9118a0407f69a66f4ac4122a39763f2625caa02c2c3046d60001b30ca2de7ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 4752 bytes
font_01_sfnt_off00008222.bin
313a49bda34c66008e25d6750fba5fa4738f25f08b4665dad7efc491c945d6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 10408 bytes

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