Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a63a72d430f24ac…

MALICIOUS

PDF

65.9 KB Created: 2020-10-10 00:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e40d3134d21ec6cbe54f48ea7b225bf3 SHA-1: fb9398b95f7590239d26cdf1d5c92c21c73b2f4a SHA-256: 7a63a72d430f24ac523ef35f5933cfeedc9a95336fe9b0afc845a3a98d1b7e19
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 redirector infrastructure, indicating a link farm designed to lead users to malicious content. One URL, https://ggtraff.ru/strik?keyword=ufc+dustin+poirier+net+worth, is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=ufc+dustin+poirier+net+worth In PDF document text
    • http://xolav.familiesincourt.com/uploads/1/3/2/7/132741198/wotirubukajeje.pdfIn PDF document text
    • http://files.hchegroup.com/uploads/1/3/0/9/130969594/5037644.pdfIn PDF document text
    • http://files.allisonjjanda.com/uploads/1/3/2/8/132814272/4721067.pdfIn PDF document text
    • http://files.incitecompany.org/uploads/1/3/0/7/130775308/4736215.pdfIn PDF document text
    • http://budanexup.tobrukbeef.com/uploads/1/3/1/3/131398225/livola_lexaruxa.pdfIn PDF document text
    • http://files.goodcharamel.com/uploads/1/3/0/7/130739878/480b7fa.pdfIn PDF document text
    • http://files.apronstringsllc.com/uploads/1/3/0/7/130739214/widaleb.pdfIn PDF document text
    • http://files.skyfieldtropical.com/uploads/1/3/0/8/130874541/wivisig.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://cdn.shopify.com/s/files/1/0483/0153/9489/files/turn_signal_relay_wiring_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2186/0007/files/american_wedding_traditions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0232/3094/files/vizimisoviluzirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf29142f-e2c3-415b-a276-fa80c7b3354d/dinowabejadujozidesodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a1bc4d-f69f-4fc6-88c8-dbfaeb771c19/65046218613.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAC 3456 bytes
SHA-256: 714b523d1bcfd1b12fce11568559595833005b980897d6753dd2b932c67ee837
font_01_sfnt_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 4964 bytes
SHA-256: 2ce794428c3b945183c23020982e5830a021ae01549011ab28a9ceb7890a34f4
font_02_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 10628 bytes
SHA-256: 69472503f01d91b25180ab0c68962f6c435a555318a0790454dcd33b75729235
font_03_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3