Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba4c184f191c911…

MALICIOUS

PDF

73.5 KB Created: 2020-11-02 13:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 654b8d8af4f4b22a3ddde8fd7a1a0379 SHA-1: 717d7305bdfeb6da11bcc4bca14db92e2d24cc3d SHA-256: dba4c184f191c911dff143fc030c98d74cfdbc538c9ee5e477493409c02c3586
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one that redirects to a malicious URL disguised as a lure for 'unblocked online games'. This URL is identified as a redirector to malicious infrastructure. The PDF also contains a large number of links to other PDFs, suggesting a link farm for SEO manipulation. The ML classifier strongly indicates 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.me/123?keyword=unblocked+online+games+66+at+school In PDF document text
    • https://s3.amazonaws.com/fajixe/point_of_view_worksheet_1_answer_key_ereading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9ff0c29b89c.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/69422751419.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/kepuxuxasali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f9e014db32fc.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/34539699601.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/51050944530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f9b29b6acd9c.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/1/0502/5067/8464/files/simanimexaruwuzebojetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425ee4a8-56fe-47f2-983f-8586f616614c/51956491792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a51beb-dbef-4f6b-97fe-b7ff3a813502/72320801315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4218/2563/files/free_redeem_code_for_minecraft_mojang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a2bfa1-965b-454c-bf5e-a83f48c4d74a/jafilopigasidulijevimima.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
🗂 Part of campaign: f-static.net 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 5604 bytes
SHA-256: 1518787326ccbbe452721fb4d8ae2923ece4062aedf7292a10cc375760092a7e
font_01_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 11304 bytes
SHA-256: 93c8f318fd42c62c2c98c062b6b20393c416a567b0d8d450857112b73afaa4ce