Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f79e6f58495e341…

MALICIOUS

PDF

44.8 KB Created: 2020-08-23 00:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d7ca3b9db1182d137cbf2432bf23c3b SHA-1: da3a58da558585111c1fdba1a966aec79babadd7 SHA-256: 0f79e6f58495e3416e7ca6e215d5d7826ea1f03bd32125b39a8ac5c968a0ce4c
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 26 external PDF links, with one pointing to a known malicious redirector. The document body also contains the malicious URL, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate 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.com/pify?keyword=arial+greek+bold+font
    • http://files.mizzellesstandardpoodles.com/uploads/1/3/1/1/131164067/228306.pdf
    • http://kezol.tobymusgrave.com/uploads/1/3/1/3/131378816/xitafugumag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/dect_6._0_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1398/files/download_ios_9._1_beta.pdf
    • https://cdn.shopify.com/s/files/1/0435/4716/4840/files/music_maker_apk_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0446/4944/7587/files/makalah_liberalisme.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/sedip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4125/0714/files/camicie_nere_uniforme.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7236632937.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/baxonubisonewijulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/realtek_hd_audio_manager_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/simple_past_form_of_arise.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d57.bin
676d9126b9a6033b4e692e853f7fb9e002c451d13ad8e76af14aa9609d8acf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D57 4880 bytes
font_01_sfnt_off00005df2.bin
c5e397ec668ed6adee02a9455acb1451101e2f6de1733f417a507af7968da3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF2 11104 bytes
font_02_sfnt_off000082f7.bin
e8051d68498e63029d7c34361d406bcd46815681d18da0e8952f0660ee027cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 16084 bytes
font_03_sfnt_off000097ab.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AB 4324 bytes

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