Malicious PDF — malware analysis report

Static analysis result for SHA-256 493b74a81ee57afd…

MALICIOUS

PDF

42.7 KB Created: 2020-10-11 00:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4bbe4af927dca63ca6ddc1bd9f133cab SHA-1: e1d4cf474732777c5d21de1951af473905622f8f SHA-256: 493b74a81ee57afd73c68dc054f050a09f5690bf53d40fe83ef72b1864664042
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to an 'Osha 30 answer key 2019' and embeds multiple links. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://ttraff.club/pify?keyword=osha+30+answer+key+2019'. Another heuristic flags the PDF as a link farm, containing numerous external PDF links, some of which are hosted on potentially untrusted domains. The ML classifier also strongly flagged this PDF as malicious. The combination of social engineering and redirection to malicious infrastructure suggests an attempt to deliver a payload or phish for credentials.

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.club/pify?keyword=osha+30+answer+key+2019 In PDF document text
    • http://files.picaprograms.com/uploads/1/3/0/7/130739745/6062433.pdfIn PDF document text
    • http://files.ginkgotree-advisors.de/uploads/1/3/1/4/131437655/jukirevininotafavi.pdfIn PDF document text
    • http://nubobuxok.ukteamchamps.com/uploads/1/3/1/6/131637873/lupujumesu.pdfIn PDF document text
    • http://files.canadoretv.com/uploads/1/3/1/1/131164273/faxomutut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed46b138-c7a8-4c48-bc60-3d4fff160085/nitezodokatozitikomukas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0e8486-01aa-43fe-8632-acb6738f3282/lazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0b7fa0-ae81-4605-8532-14ef8a4ac124/92774624098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e698609c-2a7d-473e-9983-367eff7bdc9b/52113193209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71afb57-8a19-46a3-95ba-0201cec8b59d/56769813636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0f89ca-e3f7-45e6-a50f-a4fb903c3822/47601130665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0286/3005/files/kitpvp_servers_1.8_cracked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/fisher_middle_school_teachers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AD 5672 bytes
SHA-256: 59f2a5014d5935b74efb6b9349b6f9ee45bdada70434a1c25d2039eec5d7b298
font_01_sfnt_off000079fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 10800 bytes
SHA-256: 17479ab7181151a029c2a3a77df345cfd29d7ad494b77f630db38670be700eb9

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