Malicious PDF — malware analysis report

Static analysis result for SHA-256 51739ac0b99d321e…

MALICIOUS

PDF

36.0 KB Created: 2020-11-05 09:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e9d3e026a10573ae3d4c4d96b9483c4d SHA-1: 8901df3934264447d856092123321dfb0a2bcfd8 SHA-256: 51739ac0b99d321e79e0de8f684e43231468dc704565bfa2ec1cf84e47c54352
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a workbook answer key. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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://cctraff.ru/aws?keyword=ven+conmigo+level+2+workbook+answers In PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/mekoraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f895c2edb1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5f9710020c5c0.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/tuluwe_pukixideti.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/darokisi.pdfIn 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/kufazete/78733577092.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/fish_with_attitude.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/battletech_board_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/4055008892.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/54552191445.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/gewurebivatejokutiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024bae01-cc92-4614-91c1-be64d0697058/soulja_boy_the_deandre_way_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/99992005559.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_off000043a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A5 5280 bytes
SHA-256: f52fc5ff78708cb7d855872e91fc086f76ea5b574bc7d60a9cd9efad3b7f3174
font_01_sfnt_off00005584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 9248 bytes
SHA-256: 36e64875d015d9503945563b05b67db509756b110e6097106025662ebf681fd1
font_02_sfnt_off0000750e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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