Malicious PDF — malware analysis report

Static analysis result for SHA-256 1664ba64e10d611f…

MALICIOUS

PDF

39.4 KB Created: 2020-10-20 13:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 131f5f407c9b8ea84870ae2c4d6953c5 SHA-1: 63b9ee7cdcf84d1a713d7cbb502143e9ef693c53 SHA-256: 1664ba64e10d611f28b86bdd281fb2960f84ae8bc8915b3524e35fbcf2ef9f36
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.me/123?keyword=transcription+and+translation+practice+worksheet+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8761de33320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f8d484b09e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f8801437b491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87ea90be09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f87356d7c5d1.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/riluxijozepeba-levimepumob-lokepaxan-depufa.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/6452398.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/zorup.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/f5df2391.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/zesegidewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f871fd5b5170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f8952a133445.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/3745293.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/4477203.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/bisofonitakopos-gudawubimoliw-tajabafox-wotifene.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/bc3c77c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/russia_revealed_study_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7688/8992/files/numazowaregomuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6366/2496/files/77433725462.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_off00004f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F01 5368 bytes
SHA-256: a96fbcb14922e337e6d0aa93cf4a56b36fb547092f697427986c8a319c62d1ee
font_01_sfnt_off00006147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6147 14224 bytes
SHA-256: 2db45a868ae97846661ab8423cd0f9cb9ade566486b5476e7ed6bcc461ade2bb

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