Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53a0138ec8f4eb5…

MALICIOUS

PDF

49.5 KB Created: 2020-11-05 01:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1e2f6c0cf44c4d9ff1baef3581d9b6cd SHA-1: d5b408c4c2171fac326a214b59ce5775aadf2cf1 SHA-256: f53a0138ec8f4eb5741f7b16cfca2f4fb574874eaca10bc2bc9a1f2db4eb876e
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.cc/123?keyword=bad+boys+for+life+free+online+1080p In PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/21e7578a0253b3.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/6f0de7408.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/mimujimasivi.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/6166659.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5f9f1dc5321d3.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/dff7fae4-7538-4d58-851e-abd1278715a6/raymond_forklift_error_code_81.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/turur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474af6dc-fe13-4fa3-9fee-368a49f0a4db/trapezoid_area_ws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c708a45-ce01-4ce6-b825-311c62a336af/how_do_you_dance_on_roblox_on_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39f4c8f-b788-4725-8ae8-179d5c3df8f6/69531677610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae6596f-b29c-41f7-8dc5-755e73458cea/sebiwidajadof.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/einstein_particle_theory_of_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f7cf7f-cafd-4606-9a16-09a287bf633f/texas_property_and_casualty_study_guide.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_off00007c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C79 5716 bytes
SHA-256: 2ab27b68a477f118ef8b1059f36cb9ff4fa9dfb5534965bc82d987ff2624e613
font_01_sfnt_off00008ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFE 12768 bytes
SHA-256: 32e977cb8d2b2f33fad4798765306f67f6aaf21e32735b7dd0634b70cbb5f07a

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