Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb737f2c2808a312…

MALICIOUS

PDF

45.9 KB Created: 2020-11-05 00:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0834de8b0b3f3cdcedd7d8bbbafb4d35 SHA-1: 3e25b38e98ceb823d6ad7cb91ed4aa829700a58c SHA-256: cb737f2c2808a3127bc73ecdffa683b6ea8e3bf3d649008bffc2126efd50579f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The embedded URL 'https://ggtraff.ru/strik?keyword=free+shooting+games+unblocked+games' is likely part of a phishing or scam campaign, disguised as free game content. The PDF also contains a large number of external links, flagged by PDF_SEO_LINK_FARM, suggesting it's part of a link farm operation.

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://ggtraff.ru/strik?keyword=free+shooting+games+unblocked+games In 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://s3.amazonaws.com/subud/94470069161.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/swords_and_sandals_crusader_full_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f69a182-da29-45fb-878e-af27d337d85d/bidomurexesofilapogike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b8f349-0856-4857-bac7-a6392df68971/79393778482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9998/6358/files/11987054293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d009402b-5983-40ee-91ef-6b24085a02df/42462819083.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/fundamentals_of_communication_systems_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0316/5858/files/2006_nissan_titan_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/36656807740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e231f221-9164-4b48-85c6-29c9c33877f8/58129036456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e34493-2a2e-4106-a99e-c7ec8c3a7227/19700464498.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/92968757130.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/smoke_and_mirrors_neil_gaiman.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_off000065df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5396 bytes
SHA-256: 078b4d129a9428a73552eb5c7068a675cee138b926831b35176a4a9c41ff1266
font_01_sfnt_off00007809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7809 10920 bytes
SHA-256: 38ad0b9783895dfab37f71f512559b9252469c377ec72ba1f26fe556892f7ca2
font_02_sfnt_off00009caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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