Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc806c9fbb0ceb07…

MALICIOUS

PDF

67.8 KB Created: 2020-11-04 08:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2f1e59b745e0ba203f6a1c5889e2b07c SHA-1: 5b34d3a0950b924f3cb01586141b57f4d7758aa6 SHA-256: dc806c9fbb0ceb077ed36f6b5442f12e7007ea5297cd66552c0ef955e2926b37
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the same URL, suggesting a social engineering lure disguised as educational material. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/123?keyword=circuits+worksheet+answers+physics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_5fa15c7bbd4aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8d47b76998f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f9ca8103d0e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f885ff849299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f92e0204ffc8.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/2dfda1e1-4022-4c8f-af87-da130a8c35bd/19011283679.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/lifesikobivekesipudu.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/79915317858.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/clinical_pharmacy_therapeutics_roger_walker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b358349-627c-4fba-9210-14b1372d076a/davotemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65708f9f-d22e-43c9-a003-d9f6e0515da2/katemojederuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515ada81-7b2d-4c58-b9ea-c44f9611fe65/real_scary_spiders_mod_apk_1.4.3.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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 5152 bytes
SHA-256: cff5c0d00eafe67969f00acfc27500aff5bf6d732959a2eccc5bc44c8ea86b3e
font_02_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10632 bytes
SHA-256: 5adb0cee77e67a5012b9d33150fc596570a330488b9128e1baa5285bab4af483