Malicious PDF — malware analysis report

Static analysis result for SHA-256 3873fc2d9af59a84…

MALICIOUS

PDF

44.7 KB Created: 2020-11-08 07:17:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e040bb5d5d977a1c7580b5c294f050a4 SHA-1: 163eac994f4f3955f4f9463817436baeae22d1e0 SHA-256: 3873fc2d9af59a8428f11c976ffa8dca9aeb4c50187fc4432ba8ba6a9d413c33
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/aws?keyword=manchester+terrier+breeders+ca In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f925472f0b4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gopigabipur.files.wordpress.com/2020/11/extraccion_solido_liquido_laboratori.pdfIn PDF document text
    • https://vaxonaxex.files.wordpress.com/2020/11/dhating_naach_mp3_song_download_320kbps.pdfIn PDF document text
    • https://jazefev.files.wordpress.com/2020/11/first_conditional_exercises_unless_when_as_soon_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd3a2ad-bb36-4cbc-be99-079fded73266/43624358150.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://losoxezamari.files.wordpress.com/2020/11/52891810541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b31122c-4e3e-41ac-a888-0d7fadbc167b/ohio_military_ball_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174cbf1c-e8e1-46df-8f80-c921151b46e6/suderuriragowuwami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe1f5af-4184-4d96-b025-c69f2da7ef12/gazojeziraregekivitobos.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/21530769035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b9d859-8c25-41b7-b8dc-6560561ee07f/pofapogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a3a06b-fdd2-43b5-a9bd-3fb4f1e5c03b/bararogumajuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b679f677-ab44-4fb5-b25b-46dbd9ee6968/19073122124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d001e79-b153-487c-a1b7-8514d0d86f9d/minecraft_educational_edition_apk.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_off00007117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 5140 bytes
SHA-256: 5b2acc40296391bc656d24735d4fc45261bfe5fab6002f7b37b66e0beb930405
font_01_sfnt_off00008292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8292 10152 bytes
SHA-256: 04b453ac4fe1971b7080055ddde5610459439602d63632c49ae893742c23ec09

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