Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed4d8365690dc37…

MALICIOUS

PDF

69.4 KB Created: 2021-01-11 23:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97309c138db0947f44fca8a0e71cd232 SHA-1: 8478004549938f1b795399d4c3c79cf2aad194ae SHA-256: 1ed4d8365690dc375d878750e10d340fda5dc5462218645bf4a7347b5b3bc4bf
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors, indicating a link farm or phishing attempt. The primary malicious URL identified is traffnew.ru, which is likely used to redirect users to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/wb?keyword=trenches%20tauren%20wells%20donald%20lawrence PDF link annotation
    • https://site-1171615.mozfiles.com/files/1171615/free_country_rap_ringtones.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/losibajiforogebob.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/ifjahha/lowutugese.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/dIzejh7/yu_gi_oh_duel_links_best_character_skills.pdfIn PDF document text
    • https://site-1172308.mozfiles.com/files/1172308/blackpink_all_songs_list_in_order.pdfIn PDF document text
    • https://pijatopug.weebly.com/uploads/1/3/5/3/135303623/jabufu_dosugokolazug_fejerulekisov.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/nitirew/10_business_analyst_performance_goals.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/fusowepuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/83608255729.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/8775661812.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/hellenistic_astrology_course.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/asnt_level_2_ut_study_guide.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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 5068 bytes
SHA-256: 64070ff5e92d426362dad793ea124f73a7f31dafd6595382b3d2c5e22e2ec59c
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10508 bytes
SHA-256: 64ff80fe35c9bf6857971466186d9bff498746f52a1ba9c00cfde256af04a8ca

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