Malicious PDF — malware analysis report

Static analysis result for SHA-256 723de40b1d053914…

MALICIOUS

PDF

57.1 KB Created: 2020-08-31 02:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b0eec8458806b08c59d1d14e55e058 SHA-1: d8e4d4ad33b381c648ccd68b0b1177ca1cf4cf41 SHA-256: 723de40b1d05391420fd6e3ba412d8de76343df0f59ae191d2629766f21015fd
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for downloading a game, which is a common tactic for phishing or malware distribution. The presence of numerous external PDF links also indicates a link farm, potentially for SEO manipulation or further distribution.

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.ru/wix?keyword=descargar+pokemon+heart+gold+en+espa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1cc7e8_8af25043bd5c4abca618504f4a7e4c7d.pdf
    • https://static.usrfiles.com/ugd/f96b02_8a904a6409e249ccab145f2deee72a89.pdf
    • https://static.usrfiles.com/ugd/f46427_a348df515b69450baeeba6dedfce6f64.pdf
    • https://static.usrfiles.com/ugd/6df952_b6e2688c3c794cd49acfd14a02a06623.pdf
    • https://static.usrfiles.com/ugd/41a0b6_9b1e6add992643b891f2e3f79b205b99.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5eb5ae4d6544599a977c6d99d24de4d.pdf
    • https://static.usrfiles.com/ugd/09c3c7_41554f661e7841f48182135ca1bcc50c.pdf
    • https://static.usrfiles.com/ugd/e3c460_d3273ba795294b19bac05aa35e0448f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_350d0a29eb0c4a69bdebba7ef5a12e24.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_bc7765f0f6ae4c72a1be484509722c78.pdf
    • https://static.usrfiles.com/ugd/b8c837_2543ab1ed7d14a999ebfdb3c54418f23.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81d96009fc34348a52a7f4357d28a81.pdf
    • https://static.usrfiles.com/ugd/ea78e0_767df4f2325443aaada75ce25c0444d4.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_off00008764.bin
0506c0da64211146d475e3ed35c29551e1e51a3b5e62e81b0a11a8b7f81980f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 5292 bytes
font_01_sfnt_off0000992f.bin
4964439f1f1a8a650f9d0a9311386f777f476c9cb8b7460ef7c484d0ab75c294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992F 15784 bytes
font_02_sfnt_off0000c955.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 4324 bytes

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