Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a81785e244c509…

MALICIOUS

PDF

45.0 KB Created: 2020-10-16 05:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 80b4bc7cb089241bbdde39e42aab5f4a SHA-1: b4eb017cd8e22b3c40fa35369a525897e891165d SHA-256: 26a81785e244c5097bfc69167db6b2f01c6b2cfb1ca21bf5288bf55a558d9db1
194 Risk Score

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.
  • 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/pify?keyword=beginner+jazz+trumpet+sheet+music+pdf In PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/abc91c.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/joralazokeke.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/1d32287.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/c3a547f.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/1/0501/5578/2309/files/wibezilipinul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0265/9491/files/bafuniluxuxeviwom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2960/1178/files/download_gta_6_obb_file_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/sparknotes_slaughterhouse_five_chapter_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0601/7692/files/biochemistry_ws_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4242340-da7d-48a1-9998-2f381e3a4727/93430165096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e8d513-5a1c-40ba-817d-ee2bda0d4946/gareporefawotagoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568a10ba-a535-4c4f-831b-52ba0f0804ba/legedizafepozesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14071cd8-4286-45c0-beba-9ebc29af71b0/44574474885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62575cc1-413f-4bb2-ae75-d351d7f62b1b/waxoramuxigaxavopinano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf7128a-3af5-4ca5-a2a5-348061d6e293/jukofutaronupozigevuketek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ee4975-0407-427e-b224-9bd442cebe4b/70020660171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f33d9e-7565-4659-a5c4-790c869ebe24/xunebeligunomino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b972d2-d53e-4fa0-9db3-fe9629af0190/46633017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/taylorville_high_school_skyward.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/99093854509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6307/3185/files/19718638355.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_off00006f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 5712 bytes
SHA-256: f1fe4df6f50995a409263c37bcaca6f818d5f0f514bec9704e5a48a4f9701b3a
font_01_sfnt_off000082c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C6 10472 bytes
SHA-256: df34a59568f58ffe604af441bc0a38f0c1d1380b1f51d7d3274f1de2c23db8b2

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