Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c50d2af06cc6d49…

MALICIOUS

PDF

85.9 KB Created: 2020-12-28 05:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e7f808c8c393d0f444d8c58adcb6e093 SHA-1: 7276a3351c9d0bc973d5c04ea337d6111fdbb993 SHA-256: 8c50d2af06cc6d49243d1f8394d2a7c51d27f7a2e26976467d941e9bcc99307e
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains text suggesting urgency ('account will be terminated', 'action required within 24 hours'). The presence of embedded URLs and the ML classifier flagging the PDF as malicious strongly indicate an attempt to redirect users to malicious sites or download further payloads. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=new+sniper+shooting+2020+free+offline+gun+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5fe0313939800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fa8a421f0270.pdfIn PDF document text
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/renizosidusaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/rapifukarumotixujepifozub.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/34514047531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87885d84-7d4f-427d-ab45-54179489b3a4/dcpo_nko_pretest_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/wuzijokim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e1e770-05ab-4fb7-8010-6b5a55785bc6/tropico_6_ps4_population_cap.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/kitchenaid_ice_cream_maker_recipes_sorbet.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/56595047142.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/cotton_jaipuri_bedsheet_online.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 5652 bytes
SHA-256: ef35ad468a33b4651f4c0fceec25a7e0e85cf149ead366eca5b1ef16042b4898
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 11868 bytes
SHA-256: d958325f8f4341afdfbc8e9d9f4c075fe09d831f21c9033262a82128f190d070

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