Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd68e9614544508…

MALICIOUS

PDF

43.5 KB Created: 2020-10-30 14:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d12f242ecdb68fc83d885b2edfb24628 SHA-1: 82477c325d01269e5c48fa50ab9c0f61c14341f6 SHA-256: bcd68e9614544508f0503188194e2e1506ddb65cfc88e37fd8c6ebe81bf5763d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Dr Henry A Wise High School staff' and a malicious URL. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to harmful content.

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=dr+henry+a+wise+high+school+staff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f9862f2649f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f897fd0ceb1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8db4af71e22.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/1/0501/8756/7265/files/cheech_and_chong_animated_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68e6128-36ec-4cc3-a9e3-45afa8b887bf/15129944231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c1a0f4-f573-441d-9b12-88e8a9b989fd/lufenizokederujijipuzibir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8611/1429/files/xcom_enemy_unknown_android_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7410/0634/files/25394872610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3086c68d-2444-4f08-9f7f-baaa4c3eecae/because_of_romek_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/apk_nesine_iddaa_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5726/8886/files/31148231454.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_off00006ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5336 bytes
SHA-256: 3504be3c9c31e052cc845363baf485c1332685c75f1dd51d9842c2c449b5e6cd
font_01_sfnt_off00007d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D06 10780 bytes
SHA-256: 0db517d9d243f8a0086fb7e72749097a6114b27d80606589551433821306246a