Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb78ccaee571760…

MALICIOUS

PDF

62.9 KB Created: 2020-12-26 16:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77a1224ee335ecdf839f912f96077a2 SHA-1: 1a0804da1a64f53a18618dbc4f5b3e48edfcecf0 SHA-256: cbb78ccaee571760c4842d178afe76fdbe737dc03cb9526a03e7c0f5dedde51c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?utm_term=baby+alive+grow+with+me+video'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=baby+alive+grow+with+me+video
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5fc735a218dc5.pdf
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5f99983da2d3f.pdf
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fc5f44c6c37c.pdf
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fbad04f67e6a.pdf
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5f9d1c9339a13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/figugipopar/gujokakezoz.pdf
    • https://s3.amazonaws.com/novipaliwid/93149325095.pdf
    • https://s3.amazonaws.com/potofaw/star_spangled_banner_piano_sheet_music_easy.pdf
    • https://s3.amazonaws.com/tunenijexe/ethical_business_practices.pdf
    • https://uploads.strikinglycdn.com/files/59201f80-c505-4243-904c-e7bc6f34a39e/edible_wild_plants_of_west_michigan.pdf
    • https://s3.amazonaws.com/donarepemi/coliform_bacteria_in_well_water_causes.pdf
    • https://s3.amazonaws.com/tarajix/historia_da_branca_de_neve_em.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba50.bin
382288d99d4691f937405721d1b80179f858a30c223e3221df03a2ff93896559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA50 5504 bytes
font_01_sfnt_off0000ccf2.bin
681bda8bace22d6d24c6d1b3c096b4e613a5d278d7ae3d799888a4d4768a96f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 10012 bytes

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