Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fb1a66f9ec0bc7…

MALICIOUS

PDF

46.4 KB Created: 2020-10-27 07:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e89e93b4b5cb9a995fbdec6f136048 SHA-1: 7be3346ce7dfe1adf50212818baddf7fba9179f9 SHA-256: c9fb1a66f9ec0bc71ef5a44972fd29a6781a48040bdde1f92f7984f398fd488b
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as 'Toastmasters table topics contest questions' which redirects to a known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, suggesting a campaign to distribute malicious content or engage in SEO manipulation. The ML classifier strongly indicated maliciousness.

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.cc/123?keyword=toastmasters+table+topics+contest+questions
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/2080317.pdf
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/fosararugo-noxatitujame-pukekitakagase.pdf
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/6904473.pdf
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/6904950.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5f94b13f24727.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5f8e7f3cd1878.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f88a1037eab2.pdf
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8e4f151695e.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8702d6e9ce5.pdf
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/zodetozej.pdf
    • https://vatubovelogised.weebly.com/uploads/1/3/4/3/134375195/xavavafi_vawejaximobopo_bibilime_xodorasarinu.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/morov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ff62678-7e38-49b3-b7dd-286a04d18f7c/pezexasum.pdf
    • https://uploads.strikinglycdn.com/files/e381d0c7-42f5-43b3-8454-bf0d3abd4e3c/29900650168.pdf
    • https://uploads.strikinglycdn.com/files/7d07da97-cb61-4ec3-b3c4-014bd13d3a0e/comic_book_bible.pdf
    • https://s3.amazonaws.com/kavitokolezub/86336282801.pdf
    • https://s3.amazonaws.com/zirojopemup/empirical_methods_for_artificial_intelligence.pdf
    • https://s3.amazonaws.com/sugaguxagu/livro_capitalismo_socialismo_e_democracia.pdf
    • https://uploads.strikinglycdn.com/files/9fa158c7-2643-48b5-a169-44d632daa848/wunukaxanoj.pdf
    • https://uploads.strikinglycdn.com/files/5b6a92f3-f98f-4456-8b14-fe197bec18ce/20720620139.pdf
    • https://uploads.strikinglycdn.com/files/4ef8a659-dafc-4a71-ac4a-c443adbc8cbf/24980148339.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_off000076cd.bin
fc0422cd0f9a6abb69227c712779d510fab5a64b0183dbe80e2405fcbf3102fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x76CD 5292 bytes
font_01_sfnt_off000088b5.bin
72f17ea57c910c937a43ebee8c698057ccecbe9c0ea24545af402da56e94a6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x88B5 10476 bytes