Malicious PDF — malware analysis report

Static analysis result for SHA-256 433758ccdb74c941…

MALICIOUS

PDF

92.7 KB Created: 2021-01-05 21:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a53ccd6823f8e3fa886b29ab029683a7 SHA-1: 93ee253ce15314651d1a605551a10b7105ddf585 SHA-256: 433758ccdb74c9413e89fb9ca375f8cb65fee6153abcfa8647f0a97ae7471c4d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=bitdefender+antivirus+for+mac`. The heuristic `PDF_MALICIOUS_REDIRECTOR_LINK` and `ML_NYX_PDF_MALICIOUS` strongly indicate malicious intent. The file is also detected by ClamAV as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`, suggesting a phishing or trojan payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=bitdefender+antivirus+for+mac In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f8a2de39e61a.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/TI3rih2/god_s_love_stories_in_the_bible.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/zudiwak.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/3955769.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/jhcgcYE/tepiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f8abad7c058b.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/188de79c-5bac-4a2a-9de1-562f5b455f59/adjectives_starting_with_ne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d48482-3a02-42a3-883e-022cabc40410/talking_catfish_full_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943d6c9a-0ce7-4ee0-942e-244253a0a647/17552265155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ce9c6-3096-439c-a631-5a9ebfb4e72d/oceanic_trenches_definition_geology.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/68635949878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffee115-a991-4756-ae98-7a9b39ca1aba/roanoke_civic_center_upcoming_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcd3b12-aeaf-4b90-b88c-55a75f728a04/jelly_bean_prayer_coloring_page.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_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 5244 bytes
SHA-256: d24c53613d0f6a6eabda77cbd2b094b1a8747b60182ad103613bad3e6ed0816e
font_01_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 11148 bytes
SHA-256: 93fe120a1b1b6c47345814348d722eb017b73977481dfacda366663913203ddf

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