Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef7e39f7f2b8eed…

MALICIOUS

PDF

40.0 KB Created: 2020-09-01 08:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 834ef727c1df31420c573dc9fc588a8b SHA-1: 0b64779de158ebb58e863f6c2cc0eea9e19a4e73 SHA-256: 5ef7e39f7f2b8eed10c0917aad108ed3299c878f4e1eaf7222f5234c3c7b5846
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a redirector to malicious infrastructure. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the presence of a malicious redirector and a link farm suggests an attempt to direct users to harmful content, potentially for phishing or malware delivery.

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.com/wix?keyword=icd+9+cm+coding+guidelines+2015
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/akbar_birbal_natak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/veludekijurimibamel.pdf
    • https://cdn.shopify.com/s/files/1/0472/3192/6437/files/windows_8._1_connect_to_wifi_manually.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/jijidiwakuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/zazonilofogixilolojasu.pdf
    • https://static.usrfiles.com/ugd/d5415a_a1990b526ecf42cc9d8f4e134373ffe8.pdf
    • https://static.usrfiles.com/ugd/a44510_81b5bc13e5164b9fa412442b23b6b665.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_2401930007c5488a96e8be8cf978489f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0425a56518024801944dc1c0f3b7465b.pdf
    • https://static.usrfiles.com/ugd/a18aa6_63d6d71f569f4661bc88383949d22336.pdf
    • https://static.usrfiles.com/ugd/1f2646_2d8e2cf824494bccbfdb813df80dac98.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae215fcc8554218abf0cf5653c3ead0.pdf
    • https://static.usrfiles.com/ugd/45e30f_7270651d48564f38aa9269ddca95c0a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_500c088eeb4d41eead413b466081c06f.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/kozepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1005/files/agenda_21_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/56569889610.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/42234176266.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_off00005e2b.bin
f6fa410b7fbd0be8cfa2349710554426b6b3e74375e7ebff40b61d1525e334af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 5496 bytes
font_01_sfnt_off000070db.bin
8e09b50299c6f17edeb1d080b3dc7666a7ddd7f6fc888323b8872ad7daf67e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DB 10044 bytes

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