Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436da8feb6cd953…

MALICIOUS

PDF

48.6 KB Created: 2020-08-29 09:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3c660aee6db4cb51ff48a658a9116f SHA-1: 8798a81694f4f186d23aecbfa4cd86c43b908c92 SHA-256: 2436da8feb6cd95328752dab17d8193688ff42d951651a31f47147283d155bdc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link disguised as a "driver installation failure" notification, directing the user to a malicious redirector. The redirector then leads to a link farm of PDFs hosted on static.usrfiles.com, likely as a means to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for SEO manipulation, further supporting the malicious intent.

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=driver+installation+failure
    • https://static.usrfiles.com/ugd/b8c837_7eaebefef42b4d12b2474f6936f870e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8001a335954c0597ff760a643b0b0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e07d4dac6c58470da4d7a93ed202c461.pdf
    • https://static.usrfiles.com/ugd/b8c837_68914df9eb4a44ecb18c928ff4647439.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef9067b4c92148c086f64146cbf16c77.pdf
    • https://static.usrfiles.com/ugd/b8c837_6352984f58774b3cb93fce3595cffd94.pdf
    • https://static.usrfiles.com/ugd/b8c837_166c583fa7264da5955d4ece513af4a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe21bb3b5f854e4bb769562a51c4d40a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cdca71efa4d420dae24df829404ce47.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffe4bb5b60d44115a28d07a42d7f2c23.pdf
    • https://static.usrfiles.com/ugd/b8c837_c754b328eb0644a0abb523258e514f11.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab81987757864880b9211f26daa779da.pdf
    • https://static.usrfiles.com/ugd/b8c837_f238e091b4624c17ab3f5cdfa4cb0bf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_db409db4f6a241769f915350bc4ae4e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_062837fe0af24da2b5a4b6af27896a74.pdf
    • https://static.usrfiles.com/ugd/b8c837_feea9c8c46c14084a1ed97d141a35646.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_off00007469.bin
86dd16e3e42afe8b7cef868583413d36a1531d550bb3451d4ae3a47b49950c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 4700 bytes
font_01_sfnt_off00008474.bin
05065d65d1fcd809f10d770e8cca5af046f0b9251b160d6f62967401d898fe40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8474 10344 bytes
font_02_sfnt_off0000a717.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA717 4324 bytes

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