Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25cc03dd21f6fab…

MALICIOUS

PDF

65.6 KB Created: 2020-10-01 17:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9abd69cd1282333dd762658f2c5b9c80 SHA-1: b24a398e4eb4327793baf7e1b9ce73ae250238f8 SHA-256: b25cc03dd21f6fabf7faf24e9d36a0637cb68cd71a67f06686d66851f8a1b9ee
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://gettraff.ru/strik?keyword=skripsi+akuntansi+keuangan+pdf In PDF document text
    • http://files.anniepercussion.com/uploads/1/3/2/7/132740321/disatibe.pdfIn PDF document text
    • http://files.interdimensionalspiritualawareness.com/uploads/1/3/2/6/132681368/satatapuderu.pdfIn PDF document text
    • http://kerabil.epiphanythunderbay.com/uploads/1/3/2/7/132740412/a13f33013cf80.pdfIn PDF document text
    • http://goguni.paulallenhill.com/uploads/1/3/0/8/130814328/9ebc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/8790/1087/files/57888352867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4091/0755/files/what_is_a_crescendo_molto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1529/4112/files/loloredino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9011/9329/files/28883362329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/vetowodedarokidugewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f92a52b-72a8-4cd3-9ca1-5db50740ab16/sepolumelekirejeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf604b56-865b-48b6-b276-b4a81bdfb7ad/subuloruzopexugubeparax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b020758d-84ac-4364-ae5b-8e8a99652bd7/70189588817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f971c1-6272-4b91-b0e5-1bf597fd8888/9916499210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfee1da5-a5fa-4ff4-839b-55b927a6403d/57514711671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2c2bac-bd06-41b0-85b4-41fedf3c40ff/mugunipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bccfb7e-69b9-4fb7-aaf0-8f7dcca048dc/7221263582.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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 5344 bytes
SHA-256: 3a454d3615822dabf80a48d58e6dd31acf0c087f2cd8a4d9f5b296b91a29a099
font_01_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 13232 bytes
SHA-256: 222b0aaa209a717c5d2861ef6def35fdbba96f4d249a5b0870dae930163b84cc

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