Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6012d52eb9d6a2e…

MALICIOUS

PDF

50.8 KB Created: 2020-10-27 16:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 255b1580f4aef290d1a18ffb43292ee3 SHA-1: e598ec3e998434f85570ade33cc66edec224ab29 SHA-256: b6012d52eb9d6a2e001b50946d1ca51afe9ffa6e68e6431e27927e187545aea9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to a suspicious URL. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the lure indicate a phishing 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.
  • 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.
  • 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=caesarstone+price+groups+2016 In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/4810833.pdfIn PDF document text
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/dogoduteger_xuwira.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/1/0497/9163/1522/files/63902672951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2736/5527/files/wrong_turn_imdb_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/fikivepefefagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/fabogesapidewalev.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/45012983903.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/mutexojemul.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/fizexit.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/30303491061.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/91658455074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6701/4819/files/gta_5_car_manual_transmission.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0044/6113/files/foyet_criminal_minds_first_episode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/zobel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9027/8568/files/dasogugutigiborilas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b02e24-7d2c-428a-b0f1-8e8d7cdb63be/95866834440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78179e3b-ec5e-4e2e-b4fc-61dd57794922/xanizapusosufobowafinekub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbd7ff2-6377-47c0-a683-75b334d6b880/31456739621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ea7224-36d6-451d-8809-b21237f55620/different_mirror_takaki.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_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 5452 bytes
SHA-256: 9af963140c9d25dad642a7d7dfdcb61462687f9fa749f3fe473b85675f3549f5
font_01_sfnt_off000096b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96B5 11844 bytes
SHA-256: 2a78ec27e5cba2f0d21833075b17d7468eb83296102a7c60c76470c5f7f69861

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