Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1c3eb39bbaf34a…

MALICIOUS

PDF

45.4 KB Created: 2020-10-22 03:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2101fdbeb2f99de8985bd06e8172345f SHA-1: 9c36b607478f014d1dd10c272e1d688523c204eb SHA-256: 4f1c3eb39bbaf34a6d0a724ff59697968bb46e609540507bd2f22ba8b104e663
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL likely serves as a lure to direct users to a malicious site, potentially for phishing or to download further malware.

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 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://ggtraff.ru/123?keyword=t%25E1%25BA%25A3i+appvn+cho+android+mi%25E1%25BB%2585n+ph%25C3%25AD In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8abf0917d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f90b30213c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8e020b81b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f873efc78abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5f8f47c069553.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/f6c1e8299.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/zanabopixajebe.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/sebegoboxufabi_gewikikimini_zedugagorovug_vubowogi.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/gejisemujama-wilakowetil.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/2151f4e1.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/supiwatoxanesurev.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/1430795.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/9970137.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/8dd33f12.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/457f3f9b-7874-467f-83a5-c51451fe3f6a/tozuvoluwuxazibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aa21f7-590a-4644-8f77-402fc27ccca4/xenebopoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acd558b-086e-4bf5-8d2a-62fb50525ae1/gafajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bca41c3-682c-43d5-ad24-2434d88618bb/48225167352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd846184-ccb6-4008-9860-f68969a32bba/70705954625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ba8548-b595-43aa-a361-5a80a4980a81/98251101901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b5f37e-b5f8-4ced-8a0b-40fba3bd3bc4/gufavasopitarurupipe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/79448230620.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bofopabezibubuvanamirob.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/el_autoestima.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/xasexazitalusowabekexidid.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_off00006f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6D 5696 bytes
SHA-256: 3617c75760a91fa966b56fa092d2cb732f7dff7fdf7038882b69fce118a64207
font_01_sfnt_off000081cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CD 10676 bytes
SHA-256: aa2d0b2cc4268ebe8ae97ffba8e15ff74d2f65e3dadb5b88b60fcc00a24b83c6