Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17894c7f139cbb0…

MALICIOUS

PDF

34.6 KB Created: 2020-09-11 00:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76f1fba5e3a0c8e92256666fd0054f51 SHA-1: d5c274921739e998a4258ecd3e84a4f542afd848 SHA-256: f17894c7f139cbb0334695f3b4d0642cfe48a1ba73ff4285cec8b2f795f5b4d9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the links, 'https://ttraff.cc/pify?keyword=tsunami+movie+tamil+dubbed', is identified as a known malicious redirector.

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.cc/pify?keyword=tsunami+movie+tamil+dubbed In PDF document text
    • http://files.soniasart.com/uploads/1/3/0/7/130775759/2186412.pdfIn PDF document text
    • http://files.juliaopawska.com/uploads/1/3/1/3/131380870/kamusoze.pdfIn PDF document text
    • http://files.thellcec.org/uploads/1/3/0/7/130775520/kileni_walafiper.pdfIn PDF document text
    • http://files.brendanswallace.com/uploads/1/3/0/8/130873945/lofera.pdfIn PDF document text
    • http://files.irrelevantdeportes.com/uploads/1/3/0/7/130775205/7802638.pdfIn PDF document text
    • http://lukosogi.votsqf.com/uploads/1/3/1/6/131637030/4486763.pdfIn PDF document text
    • http://files.jordanrmc.com/uploads/1/3/1/3/131380052/c8d5b5.pdfIn PDF document text
    • http://files.mscortes.com/uploads/1/3/1/8/131856039/2151bd6.pdfIn PDF document text
    • http://makas.os-kg.de/uploads/1/3/0/9/130968917/wovowapum.pdfIn PDF document text
    • http://files.carlosdepaula.co.uk/uploads/1/3/0/7/130740178/tibetemekap.pdfIn PDF document text
    • http://nebewipaw.ksupayroll.com/uploads/1/3/0/7/130739017/lajawasepipubilisem.pdfIn PDF document text
    • http://files.coveredbridgecoffeeroasters.com/uploads/1/3/0/9/130969915/9031648.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/1/0439/7599/9646/files/kendo_grid_mvc_editor_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/80455343583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/2585/8459/files/ugly_christmas_sweater_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/55993605224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4399/5298/files/karuvadotoguzibadu.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_off000049ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49EE 5024 bytes
SHA-256: bce15a96c317f562ea01c3a971059621ad977193865f96bbc3fd6d05977dfc34
font_01_sfnt_off00005af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF3 10000 bytes
SHA-256: 50c8df82245235523e5dfad9321ae089b56ae42090c78e968c012b5d6b95c273

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