Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c78d970e2415f…

MALICIOUS

PDF

38.8 KB Created: 2020-11-04 01:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 61ae6d95159db8fca0d8925e4c1424a3 SHA-1: e9652c48986124055594e2918a46f0f3e27041a0 SHA-256: 720c78d970e2415f712cc0e5c3026119c1d7ff1368aa26c9ffcea473d1f4f452
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL which is also present in the heuristics and listed as an IOC. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector suggests a phishing or scam attempt, likely delivered as an attachment.

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.
  • 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.
  • 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://cctraff.ru/123?keyword=private+placement+memorandum+template+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fa1287ed57f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fa1de32626e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f9c9b552f951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef67366-a10a-4a1c-b080-f30b154c1d56/baby_babble_word_scramble_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8264/4124/files/56258536563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e861e12-5234-438b-a2be-a737d042d028/togopeluzenem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8ceeae-1355-4f48-ac93-02f3a2821118/7059164259.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/jifuxugit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93c310b-738e-4665-9143-7bc11b172b69/perico_ripiao_completa_en_espaC3B1ol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6004421-7160-4f23-891b-b29919911e67/ff14_leatherworker_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_off00005cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB8 5184 bytes
SHA-256: 085b374574cf062bb12e8dd63c3c1346fc98030729188f793f1d0adf823340bc
font_01_sfnt_off00006e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E51 9544 bytes
SHA-256: e751c08b072842600a40af69b6538ae8ecaa49868536cd7b852c37d8583466b0

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