Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad5258bf622b6c0…

MALICIOUS

PDF

40.9 KB Created: 2020-10-25 13:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 62067bc33d6b3bd118cc66fb1af2143f SHA-1: e68e4aaad689f9bc9894f0c0d601936950235cbd SHA-256: 4ad5258bf622b6c07207c83240616b96a48fd4d9304de9796603a52b8fec320e
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, including one specifically flagged as an SEO phishing lure. The document body contains a URL that appears to be a disguised link to a solutions manual, which is likely a pretext to entice users to click the malicious redirector. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=miessler+and+tarr+solutions+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f94a941dcc38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8763fdc0f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f8d98b9e2cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f937ce16cf08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f8d2336d62d2.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/takateg/ielts_speaking_topics_files_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/que_es_agrotecnologia.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/2nd_conditional_board_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/environmental_impact_of_meat_production.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7101/5578/files/weregat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7114/1575/files/42920424379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9903/6058/files/69401566175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/android_developer_accelerometer_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3042/4985/files/fractions_worksheets_grade_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9998/3524/files/oracle_reports_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc6a7d3-45f8-4702-8bad-3ff637f9f295/72494676437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4552ab70-5ac9-4abb-9617-71471b1b216e/jadavul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b31f53f-61e9-4af0-885b-76ed6db6d13e/nekebofepid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac02d1a6-10de-4696-931c-e6ca0e94d34c/17309986447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f5efbb-e6b6-4a1a-8554-6b92e9c5c1c3/meteviseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12d1305-6667-4cda-bfc9-4d42aede0331/magellan_bryce_canyon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938f019a-7ff5-4725-8976-47fa8ccc0ebd/9954607304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf307aef-c9eb-494c-b295-647a1668ee24/75661494091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0124365-b6d6-4b14-abe8-f3c6ff3e6bf3/sarejivavanep.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_off00005da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA0 5192 bytes
SHA-256: 0144f015851cd19ac43cb5fdbbde15865cc2c18e5c7836bfa85e9ec8445bfb17
font_01_sfnt_off00006f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 11884 bytes
SHA-256: a3b0922f68f306cc77e55a95d15157fa2087aa47b4843472d3cbeb3286297ed0

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