Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0ea1a9493d34b6…

MALICIOUS

PDF

41.7 KB Created: 2020-10-11 09:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8214c53ce5844f99ae25b9df4132dab SHA-1: 7e30ebf5db981436a8591378921ac3cfc51dfd37 SHA-256: ff0ea1a9493d34b615e013693b0f3d8199cf0b8ad937d6ab86821a06a8d60a64
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and a known malicious redirector. The document body text and URLs suggest a lure related to "apk mod hack", indicating a likely attempt to distribute malware or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=apk+mod+hack In PDF document text
    • http://files.nerdwizardartist.com/uploads/1/3/1/4/131437261/56a605.pdfIn PDF document text
    • http://balajo.kathieallen.com/uploads/1/3/1/4/131453133/9966475.pdfIn PDF document text
    • http://bolov.quietcovetravel.net/uploads/1/3/0/8/130873987/tuvufuvi_buwulo.pdfIn PDF document text
    • http://files.cometboosterclub.com/uploads/1/3/1/4/131437472/likozuke-ketenedukis-xemoragub-sexevoginu.pdfIn PDF document text
    • http://subevi.crunchymomlife.com/uploads/1/3/2/3/132302966/boliwevefefo.pdfIn PDF document text
    • https://site-1042509.mozfiles.com/files/1042509/lerigewosevaterekutisaziv.pdfIn PDF document text
    • https://site-1038707.mozfiles.com/files/1038707/medopojonufuko.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/kujuxuwa.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/46952571960.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/mosakobovofomalubo.pdfIn PDF document text
    • http://files.davidhildebrand.org/uploads/1/3/0/7/130739480/rafafibize-batoba-lonipogori.pdfIn PDF document text
    • http://files.rmheducation.com.au/uploads/1/3/2/8/132815105/3e8662e2a5.pdfIn PDF document text
    • http://sisoviri.themechanicllchouma.com/uploads/1/3/0/8/130873946/9986488.pdfIn PDF document text
    • http://files.hollywoodrobbie.com/uploads/1/3/1/0/131070867/xuzeduviroxag-pofowilaweto-moluno.pdfIn PDF document text
    • http://files.zivoto360.cz/uploads/1/3/1/4/131453527/kawosoluribiw_bonutevur_nevaku.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/1/0481/5693/4297/files/shorkie_puppies_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1912/2341/files/nuvapalifekukumiduwebif.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_off000066c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C7 5060 bytes
SHA-256: f8de41794331e5642e48806b634fc0dbf8ee1a2f41c0572acd81fb0b2e17dcca
font_01_sfnt_off000077da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 10116 bytes
SHA-256: 512c6303a645482e8355766af13f61641a9dcfaed88833e000f68f338244b880

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