Malicious PDF — malware analysis report

Static analysis result for SHA-256 673fd714e487b4ad…

MALICIOUS

PDF

42.5 KB Created: 2020-10-02 07:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dc99ae63c81361c91a44983de996e91a SHA-1: e2be8f8a1899f8caa820aeeb602c5ac233b026a8 SHA-256: 673fd714e487b4ad5e9efce639c483c7211f78609faf59c380225f3c14129f00
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social-engineering attempt to trick the user into installing malicious software. It also contains numerous links to external PDF files, suggesting a link farm or redirector infrastructure. The presence of a malicious redirector link further supports the malicious intent.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/pify?keyword=half+flannel+half+cotton+sheets+canada In PDF document text
    • http://files.kelarts.com/uploads/1/3/2/7/132740445/mozopakelusemu.pdfIn PDF document text
    • http://zoralam.amyfreeman.net/uploads/1/3/1/4/131408618/fewuzeganijuxif.pdfIn PDF document text
    • http://files.uhuruacademy.com/uploads/1/3/1/4/131453595/wafozaj.pdfIn PDF document text
    • http://wumimepa.anaestheticchecklists.com/uploads/1/3/0/8/130874431/e18a76.pdfIn PDF document text
    • http://files.afeophd.com/uploads/1/3/2/6/132681824/telagulot-nupejukibajuxo-jewepoj.pdfIn PDF document text
    • http://durabijen.digitalexposures.net/uploads/1/3/1/8/131857650/2556740.pdfIn PDF document text
    • http://files.shanemorganart.com/uploads/1/3/1/4/131453174/4710706.pdfIn PDF document text
    • http://files.shopshaylondon.com/uploads/1/3/0/9/130969738/5fb61ab1bbe3.pdfIn PDF document text
    • http://nomele.madmanadvertising.com/uploads/1/3/2/3/132302921/6939da09523ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2468/1640/files/frank_the_bunny_figure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7118/1478/files/how_to_express_a_dogs_bladder_female.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0933/8275/files/principal_parts_of_irregular_verbs_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/calligraphy_tutorial.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 4716 bytes
SHA-256: 657c1aabbf4e58918499e2db6e7e353c0d89fb284baff5c7cd38a32a9e67e6ac
font_01_sfnt_off00006d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9A 9856 bytes
SHA-256: 595f98aed2d4aa32c1d7a97905b10d7d8fe35b729e3c7a7c46ee3ba95bdf68f8
font_02_sfnt_off00008f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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