Malicious PDF — malware analysis report

Static analysis result for SHA-256 5235e3faacbb3018…

MALICIOUS

PDF

46.6 KB Created: 2020-11-01 22:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 273782bad3ac06dfa703badd052791fb SHA-1: df9c9331d69174efc6f97045809da51c89212465 SHA-256: 5235e3faacbb30183642ff3121b3c2b4490a0f5c677a2a6951c8b030f9116faf
154 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 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.
  • 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/pify?keyword=evidence+of+teaching+effectiveness In PDF document text
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/dositidotenugudume.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/siwekofiwiviz.pdfIn PDF document text
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/6676621.pdfIn PDF document text
    • https://jasasenud.weebly.com/uploads/1/3/4/1/134131975/abf0963d926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/436754a1-7b7e-45fa-96a8-7c4eee5be405/12522850421.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/smallest_reader_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af303e7d-26a7-4e39-a9e8-36b550944d9c/classical_conversations_timeline_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d2a65e-d220-4b6f-ace2-d1b1e1715766/stellar_manual_tilt_wheelchair.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4025/9251/files/nexekotepawavuvetemup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227bfd4d-1e5c-4bda-ae13-483c91a7677f/rivagixaxodije.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/novogapabagemejup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6303/1957/files/epidemiology_for_public_health_practice_4th.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8069/5462/files/84842857617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d828fa87-f982-42cb-aa15-3fdee3faf750/zuwafajivizewufesufa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/lejigulibabej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9491/5738/files/95880942757.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 4960 bytes
SHA-256: e49713824ac90d8d7372f177fdc2389ac714786b268747c3cb7ee5b2d0ed168c
font_01_sfnt_off00007d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 9908 bytes
SHA-256: bedc7f9a7a9601eca13b5055175b2c1e429b1f18441f61fc45cf7dfe73082375
font_02_sfnt_off00009f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F37 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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