Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ae9b939b5fd75…

MALICIOUS

PDF

47.6 KB Created: 2020-08-29 18:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201c8346d1159b17c66aba795d90d5e9 SHA-1: fd272008887b6a491773823e8482264babac930b SHA-256: f31ae9b939b5fd753874e622182a5a83a0489137a81edbc83a49d76419d3461e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for free song downloads. The document body, though heavily obfuscated, contains the same URL and text related to downloading music. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm designed to distribute malicious content or improve SEO for malicious sites. No scripts were extracted from this sample.

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.club/wix?keyword=neethane+neethane+mp3+song+free+download
    • https://static.usrfiles.com/ugd/b8c837_a4f957d428584da5bba5d44e72cf1a90.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc492b0b03549709b0c968f3d0f165c.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d18a12e5bf4706bb62bc5982b6810e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4afb3c349ff24f3daa47911c1e51b0c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_31eafa4a4833453b89353e055376cbda.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd890c5ff2ed465bb8c35edb2f2bb3b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7be3290c59e42d39fbaece658f1d0a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a206fa750d0b4ed9ba0f4970787080d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59f01c313944bd89b6c6d5c60b9c983.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee62c131f8448449de202204ebdcb1c.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_c7e97aefd2a8416d9d0402bd8822bc2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19ae811a6e5425888552086771aff93.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae7da68bce8846499a4a1e36268d7291.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eceea9b7583450080bd437e401494f7.pdf
    • https://static.usrfiles.com/ugd/01e791_5f58d65e597b458194b10dab2563b6d0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e7.bin
0d7e0d30ee2dec8bd5c2eb57fec263520d6caceed35cdceb7fd2ad942f7cc170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 5680 bytes
font_01_sfnt_off0000771a.bin
c7891fc8a305f8fce77ce8ca4ca6a5aaa6dabd043777c6d8da5d67ab26f61ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 3124 bytes
font_02_sfnt_off00008394.bin
cbfbaaeb436527378deade80b1783f57f8ce5f84d36cf4020ee1eebb2dacf669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8394 14548 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.