Malicious PDF — malware analysis report

Static analysis result for SHA-256 4161192b90519e28…

MALICIOUS

PDF

41.5 KB Created: 2020-10-15 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce35029e09ac82671e46fa8d5656e148 SHA-1: f9e9eacf4170d1a2c55ff43a2d669b58b78be255 SHA-256: 4161192b90519e28af5c3856ec9f0722818b0c1dadcdb5c30372212b82ef710f
124 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest a phishing or redirection attempt, likely leveraging a PDF vulnerability or social engineering to trick the user into clicking the link.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?keyword=nintendo+wii+emulator+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8768e63cbdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8771db3e142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8745037c658.pdfIn PDF document text
    • https://site-1042770.mozfiles.com/files/1042770/wow_vanilla_viscidus_guide.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/gedupi.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/cf2e85e.pdfIn PDF document text
    • https://site-1037897.mozfiles.com/files/1037897/5751039988.pdfIn PDF document text
    • https://site-1043752.mozfiles.com/files/1043752/kogusiwugunututudelisa.pdfIn PDF document text
    • https://site-1038810.mozfiles.com/files/1038810/86210573074.pdfIn PDF document text
    • https://site-1043855.mozfiles.com/files/1043855/65951159908.pdfIn PDF document text
    • https://site-1042889.mozfiles.com/files/1042889/57849192954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9436/6626/files/notefogawesoladiravakevew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7617/7051/files/duvibupaxakafaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4872/9767/files/93911145427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8761/3096/files/fetamavikerofeximibugavew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7292/8920/files/kulugevidivuvipuwos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0143/6569/files/unblocked_games_dragon_ball_z_devolution.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_off000064fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 5052 bytes
SHA-256: 44cd4aaea4e39b6fcf5cc7a460b1b18a902b86158aff43f7b9ff916330131b3b
font_01_sfnt_off00007620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 10220 bytes
SHA-256: 9d5a55ffb7fc162c223eb42b489c4fde8dbd105598fb939ab1becab0d94155f4

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