Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8d579710142dfa…

MALICIOUS

PDF

38.9 KB Created: 2020-11-03 18:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 156f40df6d3f8af65c1bee0eb98c5eca SHA-1: 9333dd02eda66eff62eb507fda125ac475beeecc SHA-256: 8b8d579710142dfa90d16e4ace3c8756e06b401271ca8238d03d2ed672efbc99
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document utilizes an image lure, presenting a screenshot of what appears to be search results for 'my singing monsters hack for kindle fire'. It contains a malicious redirector link that points to 'https://cctraff.ru/123?keyword=my+singing+monsters+hack+for+kindle+fire', designed to lead users to potentially harmful content. The document's structure and embedded links align with phishing and link farm tactics.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cctraff.ru/123?keyword=my+singing+monsters+hack+for+kindle+fire In PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/gebuwulivorovew_lofiza.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/8106763.pdfIn PDF document text
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/4845424.pdfIn PDF document text
    • https://zirasave.weebly.com/uploads/1/3/4/0/134096010/wagikifukera.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/1494720.pdfIn PDF document text
    • https://kujavubudiza.weebly.com/uploads/1/3/4/4/134497056/safajazele.pdfIn PDF document text
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/49582838.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/rokolalaxub.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/liwixo_pavajow_nekotafixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/cheikh_ahmadou_bamba_books.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/real_world_applications_of_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/larosiluzigotanegixuparex.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/marpol_73_78_annex_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e677e9dd-44bc-4932-8e20-fa46439014fb/marvel_future_fight_beginner_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d125af8-24cc-421e-ae96-9ef50ea8dd3d/32235552009.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/benthic_macroinvertebrates.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_off00005fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD3 5608 bytes
SHA-256: 4ad21cad17fd66639af87cacbefda68f85c8c3843c9a8588dc328b641904e82f
font_01_sfnt_off000072d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 8020 bytes
SHA-256: 33036bc1abb8ee9576c1f06a32d56671109615a10589509065237d159b3a4f11

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