Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a26ef0c8b0fea2…

MALICIOUS

PDF

56.3 KB Created: 2020-10-26 17:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b6972b953d33ed4d2fb1178d2bf26bca SHA-1: 85feacca889d126bb0ac9ce91067322375b205e6 SHA-256: 65a26ef0c8b0fea2f204aa9faa3248cb371db121843af1996473dcfae9628326
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a URL associated with malicious redirector infrastructure, disguised with keywords like 'uppcs exam syllabus 2020 pdf'. This suggests a phishing or scam attempt to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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.
  • 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.club/123?keyword=uppcs+exam+syllabus+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f8c896ca9ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f875194d1903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f96b8c877d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f87b55dea620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f92693fc584a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f8a6126c9b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8d9568a8b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f89f84cf3316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf4c00a-70cf-497a-a48b-5a081d9acf8e/82583163975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3601f2b-ae8d-4805-bba4-c70a4ad66102/soradufugatufapaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee02eaaf-b0dd-4481-a851-8e2309b60f42/62341514100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a422f0-8029-45a3-aada-e0adbf5821a0/96437679153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9122f489-2e7d-4e4e-a56d-69f0612885ae/54663605856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6972908-64e8-4112-bac7-9828b7cf785a/sukasejejufosuzoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d3d1bc-cf46-461b-ad15-5f396c101e0b/lilupinaranekefibor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0d4327-a32c-44f4-81eb-94ec24ca577f/83324727409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee80337-a849-411b-8b2f-7068e09ddc0d/khalnayak_movie_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/bunodapifakatoni.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/gisulaxubowoxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b73411e-b88e-4675-9e01-3dc15c98baf9/21878043104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080b001b-8101-4600-afc4-9c0dae8e2604/jivasafenuredebepatujofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb8034a-25ac-4608-b3e8-3024463fd113/draconic_translator_skyrim.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_off00009a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 5780 bytes
SHA-256: aa9818fb1d2a19654816b868850c1372085a3852dd155c99999b9e8078f22ea3
font_01_sfnt_off0000adf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF7 10976 bytes
SHA-256: 40c854c2af1f4784e8426d45260176cc707988608f1ff86d9f97a3f754829368