Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca83861520d85f1…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 22:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c38880105df857beec727b105a110ef1 SHA-1: bd802fd7a3a62fd189afe54d67ba9aef1a29b846 SHA-256: cca83861520d85f189cdebe79f3c14f57bdc21b16f7b33a27276e61f884d8113
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://yafferge.ru/wix?keyword=unblocked+games+mario+64' as a known malicious redirector. This indicates the document is designed to lead users to harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://yafferge.ru/wix?keyword=unblocked+games+mario+64
    • https://cdn-cms.f-static.net/uploads/4453906/normal_602956343b6f5.pdf
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/setexedaw-joluxawojip-jorezunan-jutewi.pdf
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/zobinidekuk.pdf
    • https://cdn-cms.f-static.net/uploads/4414486/normal_6013bc97c40fe.pdf
    • https://cdn-cms.f-static.net/uploads/4403266/normal_602ed66f2c54d.pdf
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/vesipu-zafeduwapivizo-tozegedutiwuw-kerokitatesujow.pdf
    • https://cdn.sqhk.co/sisowufabo/Iq3jgji/video_calling_samsung_tv.pdf
    • https://cdn.sqhk.co/tazuxalana/esNqi3o/piggy_book_2_trailer_animation.pdf
    • https://numazerezawikar.weebly.com/uploads/1/3/4/6/134618887/9c71844284.pdf
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60210e1b58a55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_64e2bba69ded4662a3d1c3f5053472d7.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_e337a319bb1549878ad404c716ab3011.pdf?index=true
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_0b90480168b045cc8a2e24c8f3529e2c.pdf?index=true
    • https://s3.amazonaws.com/mejobu/oc_choppers_meme_template.pdf
    • https://s3.amazonaws.com/rupatojuko/android_app_obd_auto_doctor.pdf
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_62ab8b82c25a48be8dcb0b0b7e1597c3.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_6953d728a5df4007bf92021dcb528a1c.pdf?index=true
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_c48a7b46fd8b492eb341689c99aa101a.pdf?index=true
    • https://s3.amazonaws.com/jefazaxal/vodopixuzaduzalesijeku.pdf
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_d14bdff242dc4f9893b1360e3780b0ad.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_72566be793024841b7cdd3c48104d528.pdf?index=true
    • 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_off0000f782.bin
dad534b1e1dee60dab101c07f70117f370ba0e052f009ba6b83b7b00f1ec0df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5696 bytes
font_01_sfnt_off00010ad7.bin
d67ff2261f59594bc7488982493e35ca96e1d5ae2aa8e15077b4d03ffb086c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 12044 bytes

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