Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7bacb01901d7d7…

MALICIOUS

PDF

50.3 KB Created: 2020-10-25 14:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b4fffda760ed76971272e367d804e7ef SHA-1: 1238491c03cb1952f7f48e131edf9cca969e950e SHA-256: ac7bacb01901d7d72368f4c2025c8e3beb0154cf1209df3113bc5f8a0e6361d9
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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?keyword=wifi+wps+wpa+tester+premium+apk In PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/698832d9.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/558ef243d08de1.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/d274ae3ef544.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/teragikim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb90841-0da8-43da-85e1-5eaefab7b4c4/66292302510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f6e4fa-36b1-430e-a04d-f9f7e958dd11/fideruruwaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab847d25-2a38-4dca-a911-c252d10a679f/51985754594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9351d6d-58d8-4884-9d14-a2f7947027eb/36480418875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185ee4cc-1df7-4a01-ab3a-93650a46d55e/vifitonivesafodojovot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a020e23-c08e-43a5-b493-70e2ada2d292/sony_nex_c3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8148f559-6b62-42a8-af5a-9de76636a149/sonufivelavixiwukokegobaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a26fba-d883-41d0-a9ec-d1d7e5d4cfa2/30272588824.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/current_cm_of_all_states_of_india_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/26716087009.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/strategic_planning_process_steps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/difference_between_accuracy_and_precision.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4268/8154/files/kenagasaxizujekamageba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 5184 bytes
SHA-256: 77d5e404ed233c701beb76511a00e0508c2c5a927e740a41dd37ba8ac5226434
font_01_sfnt_off000073ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EF 10372 bytes
SHA-256: 48e4e02bdb97d517d46f8a185cde1a31ab2a9365ede37f34a286aa270694ff83
font_02_sfnt_off000097b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 21740 bytes
SHA-256: 36a291ec2142f9cbc8c859dab6f40baae9d572556ff4519ca83b36410b44193c

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