Malicious PDF — malware analysis report

Static analysis result for SHA-256 3629b7858f26c4f6…

MALICIOUS

PDF

43.8 KB Created: 2020-10-14 23:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b005056e2229b89ff24185b2b462e7ce SHA-1: 78f87b5954ae6cdacf98d184baa2a7588e72c7bb SHA-256: 3629b7858f26c4f618ec24490e902bab2bfc5223e114aadbcfeb6e6ac6976f7e
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 pointing to disposable hosting and redirectors, indicating a link farm or SEO manipulation tactic. One URL, https://gettraff.ru/pify?keyword=antioxidantes+en+alimentos+pdf, is explicitly flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Antioxidantes en alimentos pdf' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious link distribution.

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://gettraff.ru/pify?keyword=antioxidantes+en+alimentos+pdf In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/6718811.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kojurufilufopimob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f851aecd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87086c4e88b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8729acc6e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f86f58aced9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f873c2caf551.pdfIn PDF document text
    • https://site-1039922.mozfiles.com/files/1039922/jorukunulepirut.pdfIn PDF document text
    • https://site-1040785.mozfiles.com/files/1040785/5900375339.pdfIn PDF document text
    • https://site-1039313.mozfiles.com/files/1039313/95672354035.pdfIn PDF document text
    • https://site-1040896.mozfiles.com/files/1040896/95709327743.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/1/0436/4432/1945/files/mp3_player_bluetooth_speakers_pcb_board.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/5540/8071/files/baxi_back_boiler_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0396/9173/files/boone_middle_school_fights.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/19860153802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01affd29-02c1-4c33-958c-1a082280f0cf/puvixigetutedatesiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225c6646-58bf-49d4-8225-2bac158f1c07/40348651688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1c99ee-14c4-40dd-977d-10e766e8c236/metupofilagulip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec5fdbc-5f44-4ecb-8633-170ea6dfaf98/20543127578.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_off0000696e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x696E 5148 bytes
SHA-256: 8976ce90249d0c58a4e0b328e21c0b890912cbdcba83a536f9459a6932e71a2d
font_01_sfnt_off00007ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 11416 bytes
SHA-256: 5c2c2ec48dfe73d53ec9ff6243c2a3704704c4a41e2625647d3de1ca1fa767bd