Malicious PDF — malware analysis report

Static analysis result for SHA-256 412c4bb5fed559ac…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 12:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa0d6fcb56aa792e50dba59d269d2ba SHA-1: 5988d582028083ff2657961a246014a8ec2a9321 SHA-256: 412c4bb5fed559ac587540d4d4220854e2eed6378afbc7adb9525a9d55fbfa5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a subtitle download for 'Mr. and Mrs. Smith'. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The PDF was flagged by a machine learning model and heuristics indicating it links to known malicious redirector infrastructure.

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=download+subtitle+for+mr+and+%252Cmrs+smith
    • https://static.usrfiles.com/ugd/930050_28792eab831c4b8b9da939da3b37011a.pdf
    • https://static.usrfiles.com/ugd/d43733_6d7b1f75cc2440e0946aa2c390eb1733.pdf
    • https://static.usrfiles.com/ugd/b8c837_114e5d7d0dcc4541a4bc9ba8b55104f5.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_7d44c4c9e20740018f5f1a769363c5c0.pdf
    • https://static.usrfiles.com/ugd/7dd30d_e50256ed06e74d938721ed9406a4b385.pdf
    • https://static.usrfiles.com/ugd/b8c837_cade67cea84a41fc9e88258cc3f9f00a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f4d587ac53d4842a8a9de53f98e2172.pdf
    • https://static.usrfiles.com/ugd/8b9728_d96fbc5d776a4b6e98ee8bfddc6ab955.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
    • https://static.usrfiles.com/ugd/90423f_206f93d9e51945ab97b15c9fbd89ce39.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e964f10dfb44093a9bb5e92cf1760f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6af028dd38a34b048515a74489ae655a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/b7306e_88f1275e8730439eb6ab57323ba82adb.pdf
    • https://static.usrfiles.com/ugd/756799_57ece9941e35479583228e6e29f58994.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bc.bin
e6dc042b4cb4485826c7690acf64a3554e834aff62402064c43550b2e1d1a20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5432 bytes
font_01_sfnt_off00007425.bin
9d1aac91ebf769129a01d74bb9de7e9d1f17c7e8320580d7fca55e2fd80a4de2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7425 10744 bytes