Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbbbc800c4a309d…

MALICIOUS

PDF

45.5 KB Created: 2020-10-15 12:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d94d1c4e660f68d696d80ec93e45a50 SHA-1: ff3895a7f899bb3e60b5100effddfc93716a3c25 SHA-256: 3fbbbc800c4a309d7b93a98792d35c5cb17abf1cbdd613148f7c857fa6650e72
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a PDF related to 'particle size distribution'. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL used to funnel victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/pify?keyword=particle+size+distribution+curve+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8764a84a3e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f87a0754bb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f879cba1f342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f86fcdb5387c.pdfIn PDF document text
    • https://site-1043403.mozfiles.com/files/1043403/85902766696.pdfIn PDF document text
    • https://site-1043917.mozfiles.com/files/1043917/20712187407.pdfIn PDF document text
    • https://site-1042011.mozfiles.com/files/1042011/buxidizopizikuvevujapene.pdfIn PDF document text
    • https://site-1038409.mozfiles.com/files/1038409/beparuxarodif.pdfIn PDF document text
    • https://site-1044455.mozfiles.com/files/1044455/64201079046.pdfIn PDF document text
    • https://site-1041785.mozfiles.com/files/1041785/93734090584.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/58845191285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7501249d-1c99-4914-888a-1ba3bfa10d4e/kemuwuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e843cf6-5cdc-4e5b-9e28-942c8b675b21/12593039915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63c79b8-047e-4fa8-bd1e-782fb77a845e/sofekimonukofolofedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b72a92-f9de-4ed2-b7da-3aa46ed3aee2/95647266460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8922549-eb12-490d-9950-3568b10f98a1/sefigipabanikatuzemixipuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8776/4898/files/origin_story_vs_nameless_midnight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6286/8633/files/82119041958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73f66df-3cf4-467f-a13a-5f450c4249bb/gipifenosisofora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275fa040-5f6c-483e-b937-7ab52772dc15/fireganubid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5284 bytes
SHA-256: 95337b7a82ac5a04f4f783014b776455b58e0b18dbe0c2286fdc1e7b6594c753
font_01_sfnt_off000078c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C7 9832 bytes
SHA-256: b22e4ab0f781439070c101f292bd8cfa8aaa0414da514cabbf37c87ea06d1cd0
font_02_sfnt_off00009a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A49 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.