Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac3ac642f1917b6…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 03:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20000e79769d0e4a96c70cf968df9601 SHA-1: 4ee606a267e79a65b167b3c04b574880b1638237 SHA-256: aac3ac642f1917b6174daf45672b7ceec5881a62422e3bf1765ba51211c783cd
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF link farm'. One of these links, 'https://ttraff.com/wix?keyword=assassin%2527s+creed+revelations+flickering', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content, possibly through SEO poisoning or a phishing pretext. The ML classifier also strongly indicated maliciousness.

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=assassin%2527s+creed+revelations+flickering
    • https://static.usrfiles.com/ugd/b8c837_4790fbe219834295adedc6bdd37ade90.pdf
    • https://static.usrfiles.com/ugd/5b5da7_565b3587a23641a4b7a83d5910353527.pdf
    • https://static.usrfiles.com/ugd/b8c837_f83f012773864f15b88dd7246eeb3c87.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f64670ca74bfea1e12801b3e01b00.pdf
    • https://static.usrfiles.com/ugd/34e21e_5ac9edf97401407b9e263111e91ac3fb.pdf
    • https://static.usrfiles.com/ugd/e1c37d_bf407f7f7a9a4863827034fbd5513307.pdf
    • https://static.usrfiles.com/ugd/78c764_8eb0069147ea4441b564421a53533203.pdf
    • https://static.usrfiles.com/ugd/0511f5_c42bf30aba7941f399e273fefa69db93.pdf
    • https://static.usrfiles.com/ugd/fb83f1_5da92c37e7e5488aab631543fcae287e.pdf
    • https://static.usrfiles.com/ugd/8de238_515e161b314a46ba8097dec912b487f4.pdf
    • https://static.usrfiles.com/ugd/834936_209c2351a665415584ece1bff8ef9c8f.pdf
    • https://static.usrfiles.com/ugd/a86d68_363c9152bd434ad4ac271c735ec1b5da.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_off00005987.bin
e2003870c00999237819198a00db5ad7cb6788010f12e9edf405e99247d038a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5987 5336 bytes
font_01_sfnt_off00006bc1.bin
07d0679421511c367f1d50ed6720a9c7b11722123eb630d3fd86aecf2b9f237e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC1 10448 bytes