Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdd8d6b3aaeb856…

MALICIOUS

PDF

47.1 KB Created: 2020-08-29 13:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d02a767597cf31d1b4969f1b5c4a4b SHA-1: 38c1d3ac1f83a2be49e2f6a49c460cad14a3544d SHA-256: 6fdd8d6b3aaeb85646a98a51ef4ef50db97b6590e664dab3cba9130284b055b9
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 16 external PDF links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and several benign URLs, suggesting an attempt to disguise malicious activity. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to 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.com/wix?keyword=3+mistakes+of+my+life+novel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/b8c837_4b9746658cfc488088f5c7229684231e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd7681ab6534374b477d4aa1fe4b1fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_686d7e1507834feaa6062da4f1634f69.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa8fbb4b95394160820bdbedba2ec3fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_d32996d0bfbd46f9bb88b303c60f149d.pdf
    • https://static.usrfiles.com/ugd/b8c837_64e5bb49698a4c9bad2780874bc10da0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc503f24417b462ea3bc3be0090d796d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b60b0c50f844d458b006f84c3d5d206.pdf
    • https://static.usrfiles.com/ugd/b8c837_efecfac215454b0e9be89bf658fd3c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e4e60300a364766892853ec9bd7eabb.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c28722ba0fb4ef7952034c59dc9e030.pdf
    • https://static.usrfiles.com/ugd/b8c837_8efc84ac797149e7b103bb65430a3f90.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c7359982ed24ee2baf6faef56330ab3.pdf
    • https://static.usrfiles.com/ugd/b8c837_98999d05c9434b8fb7a634a0e4bb6b43.pdf
    • https://static.usrfiles.com/ugd/b8c837_8341c4b656a844e8b5af283556d54cae.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0c54128f9be45bd9811e22d18947e0a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694c.bin
094c790bd359b3db3dea3bcfffb20c58b9af6599cd7d80e1277b727df4932327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 5112 bytes
font_01_sfnt_off00007ab2.bin
fe3d21d09d0b63017c1c9ddd6e3e3ea7ebfd4bc9f79aa2e1a323bdabbeeb418b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB2 9820 bytes
font_02_sfnt_off00009c6f.bin
eda6aad208e4ad4dba43a919104f0afdba3eedbfe7d423d60fec365bf90542f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6F 5236 bytes

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