Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4104f8cc7861f…

MALICIOUS

PDF

48.2 KB Created: 2020-10-28 03:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4c6c948b6f0187463a16277077246f16 SHA-1: da1514de2abeec6656363cd9252717c915d86dab SHA-256: 81d4104f8cc7861f8c3f767bd63ec318b27d8d0b82e5d88427e7bcf213f183ea
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.ru/123?keyword=polk+salad+annie+lyrics+elvis In PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/7554287.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/1268138.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/8783645.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/6458110.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/dokiwanisexowes_wamapivunuxep_gokofe.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/teramonimavepaz.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/wedazugibekud-perapivamopep.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f8ffedea28de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5f95d00477892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f98c743510e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5f96590ca6752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f97d89365870.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/53acd958-75d8-4656-817d-7ad403f5dc92/bufero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ce4a1c-99c4-47c4-b7db-2b7c414b53af/82924288792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86a78ab-1596-4e69-be97-bd26cd248fe0/xowel.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/catecismo_de_la_iglesia_catolica_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/annotate_documents_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/renaissance_periodization_program.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/97809934622.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/zakakejegenapapeg.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/nerezesazijavoji.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_off00006750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6750 5160 bytes
SHA-256: d27271d7ad29adefbe31245cf57366e03e54446a4d2ebda41bb4db9ae5038ed8
font_01_sfnt_off000078f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 10900 bytes
SHA-256: f513a0034cf08fbfc9816cd8c2b79636dc5a3cd1e42887160ce80dfe9fafef14
font_02_sfnt_off00009dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFE 16160 bytes
SHA-256: 7e63eb3bed9c4ceaf47e86587cf77a789dba98dd2b4db382f0c7f052a0aeb8ce

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