Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61bf5ec3334e524…

MALICIOUS

PDF

40.5 KB Created: 2020-11-03 01:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 8937bb1a584227f7fcac17d14f7e8205 SHA-1: 3c2c4dba6e4baaae33eb3840f703ebf05468c3d8 SHA-256: b61bf5ec3334e524565fa6b035e39c9580579f20a42747aa0d9944cf541622ee
184 Risk Score

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.
  • 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.
  • 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.link/123?keyword=cover+letter+examples+for+grant+proposal In PDF document text
    • https://lafapimiwegu.weebly.com/uploads/1/3/4/0/134041150/d782c20ac58783.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/vadefanewakikup-gaxugekul-sosilefegosisa-nepaforubakibuz.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/9583700.pdfIn PDF document text
    • https://molegogadamo.weebly.com/uploads/1/3/4/3/134341439/6931952.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/tugaxevedo-gujikasur-numuvo.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/medirarinebufi_dudubaxenewujib_mevefowupo.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/xabuxeremulaf.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/sumaxika.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/9781852.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/wapet.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006262.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006262.bin)
    • https://s3.amazonaws.com/wujapu/honeywell_10k_sensor_chart.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 extracted file (font_00_sfnt_off00006262.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 5252 bytes
SHA-256: c9dff88e74f8dad8d3727bd6d1b29c315c737044a891896a9457d7d7f683fe56
font_01_sfnt_off0000742f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742F 9676 bytes
SHA-256: 697a5fa469ea8e913be883c39b056244869ce0935bdd80e89f51254873cbecaf