Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df783a7ac26edfb…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 19:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d7cf396393e726ce3b724f3326bc5c SHA-1: d889d70dd0215f7c8cdf48b252ab53e8d9bb215b SHA-256: 0df783a7ac26edfb2c91313750addf632e931edb11df4f1a7b99698a56b47aa1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body text, though heavily obfuscated, appears to contain a URL that is also present in the heuristics, suggesting an attempt to direct users to potentially harmful content. No scripts were extracted, but the presence of numerous links and the ML classification strongly indicate a malicious intent to redirect users.

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/pify?keyword=2017+ashrae+handbook+fundamentals+si.+pdf
    • http://ruxaw.clayimpressionspottery.com/uploads/1/3/1/4/131437987/dizizefavivemifavu.pdf
    • http://files.angiezinserphotography.com/uploads/1/3/2/7/132740804/a9c2341b.pdf
    • http://files.capefalconkayaks.com/uploads/1/3/1/3/131379223/2717859.pdf
    • http://demokato.ithappensthebook.com/uploads/1/3/2/6/132681459/vofozovok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7804/8161/files/kikuwiguvikafedopulena.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/bd_cytometer_setup_and_tracking_application_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/72258159827.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/aerial_lift_osha.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3090/files/disexewut.pdf
    • https://cdn.shopify.com/s/files/1/0453/6470/7483/files/mariadb_for_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/68146384419.pdf
    • https://cdn.shopify.com/s/files/1/0443/0443/3308/files/8666406790.pdf
    • https://cdn.shopify.com/s/files/1/0461/7702/6201/files/chimera_tool_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/medomojisupekal.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_off00004ca6.bin
a362a534407a59d2b12823af5e7aed647dc69ffca86d3250e7fcb245d77b0f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA6 5712 bytes
font_01_sfnt_off00005fd7.bin
4accd3b44c64b11a0b5e9e5734409048fab35e01435b163a1069bbbd92f27c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 10108 bytes
font_02_sfnt_off00008283.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8283 4324 bytes

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