Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f74e62c6eb950e0…

MALICIOUS

PDF

48.4 KB Created: 2020-08-29 23:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2bfb55a5ba7ed5bb2967aa18b0537bc SHA-1: 5b9148ed76ca3010da080e46e8536af65a028ddf SHA-256: 6f74e62c6eb950e0a1eb24dea7f9cc13e929ef0677881a86e2b47e6a5a54c5aa
162 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic generation. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=manual+del+usuario+pointer+2005
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/pazilijovudoniloses.pdf
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/chuyn_thnh_hnh_nh.pdf
    • https://cdn.shopify.com/s/files/1/0448/4320/4765/files/asperger_s_syndrome_a_clinical_account.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/xelobikojobiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/bikokisevabinelitexebowuk.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40a06dee65b4ebbbabd8150b28c8d04.pdf
    • https://static.usrfiles.com/ugd/b8c837_65935f0f44a7452cbeb395df8629532b.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_f64e2e6e6669421ead932d1a8fbf8688.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2207/files/jikefekup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/3909985700.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5822b34ef1345ed99d76deda65a4480.pdf
    • https://static.usrfiles.com/ugd/b8c837_250efd67a331445ab6d6eff729935873.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e04.bin
5c50d67f1951c99b346e854ab13f3bd64154741f8c39ae68d6b136afc2c6faf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E04 5356 bytes
font_01_sfnt_off0000904a.bin
dd92dcdf4c509c47c84688f61179ff33d1dd0fa3d046020f45582bf0c31d332b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904A 10616 bytes

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