Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ec2a83dedcfd3d…

MALICIOUS

PDF

66.3 KB Created: 2020-11-13 06:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3bc0bc584d5aed44e4f0987b4b12290c SHA-1: ceeffb1db3d071aa33759fab1fb8f2d696c71318 SHA-256: 57ec2a83dedcfd3dc1f25f97f44b60cce3bda7b27eb246e8810cc4ba11267e97
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to malicious infrastructure, specifically `https://cctraff.ru/123?utm_term=how+to+make+my+voice+deeper+reddit`. This URL is flagged as a known malicious redirector and part of an SEO link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=how+to+make+my+voice+deeper+reddit In PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/wepirorogekozuvo.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/malegufom.pdfIn PDF document text
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/7463022.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/buzukiwobu_mekisojedaro.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/7440546.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/tetazino/15960902919.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/spring_framework_java_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/dejulesosibexejagepe.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/baboregudiwavodafi.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/69594300105.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/28723276787.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/titanic_piano_book.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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 5288 bytes
SHA-256: 3c449eb2a59808880bc6c1154e128e83b58db9c620c6503e0358b95b19275a9f
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10240 bytes
SHA-256: 04cdfb8559cfef04b2e859adcff026563f2911d9d7dcce99393de6135d7e325d

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