Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7c2cafa8747f98…

MALICIOUS

PDF

66.4 KB Created: 2020-11-22 02:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 00fb509b05bde735fecfde183704b5f9 SHA-1: bb9aae5dca6465e5e41912bf6c7de5f40a6c5214 SHA-256: 5e7c2cafa8747f98817bef3dc18d4186205f997e074460f5bf79389bb1ced20a
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, including one leading to 'ggtraff.ru', suggests a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to 'ncert biology class 12 notes', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=ncert+biology+class+12+notes In PDF document text
    • https://rinajota.weebly.com/uploads/1/3/4/7/134714435/nokugisoti.pdfIn PDF document text
    • https://sefenavimeta.weebly.com/uploads/1/3/4/8/134885596/efe2be79bca.pdfIn PDF document text
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/jiregepikajomifog.pdfIn PDF document text
    • https://wokesije.weebly.com/uploads/1/3/4/5/134597961/monodomel_feforibawixefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f9be32b977d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f9f670d9725f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fa4f88e711a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebaxa/oracle_iprocurement_user_guide_12._1.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/happy_birthday_song_cocomelon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f103bf83-151b-4dae-8e56-68cfc7a1b937/in_my_blood_lyrics_shawn_mendes.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/65863873937.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/zawan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a6036-0401-4a32-a911-527dbcc59f04/girls_frontline_black_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed40fa21-c16e-456a-a799-f7a61b87f45a/80118630745.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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 5364 bytes
SHA-256: 22ef85300b06a986a858e4c68eb31ecd19a7dcf0bea67b7c5eff285cd93496a9
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10224 bytes
SHA-256: c65cc5e7488f7c7811fdc57cdaca706e8192e8a51bf34749966128f9b1828efc

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