Malicious PDF — malware analysis report

Static analysis result for SHA-256 492edc9ec884d1c6…

MALICIOUS

PDF

45.0 KB Created: 2020-11-04 01:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be798cc92641eaeaf1957a1ca1d8641f SHA-1: 2e68ac5aa0da9c9162f0f8e4e1c2a0652e3e0b6e SHA-256: 492edc9ec884d1c6ddba73fb84e5d2241f06851002e0852fae983ef06cba0980
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a redirector service, disguised with keywords related to a game guide, which is a common lure for phishing attacks. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link. The embedded URLs suggest an attempt to direct the user to a malicious site, likely for credential harvesting or malware delivery.

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.link/123?keyword=ff14+machinist+guide+stormblood In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5f9044d2386aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8e511399508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5f98290295c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f936b91ab8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f8bdb9228985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_5f9ce3056c2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8eb1051b7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_5f990d1228c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f9de2961688f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f9191ab9bfad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f95ab6ecfbaf.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/d346c943-41a2-4256-99c0-ff48731ad098/volume_of_a_cube_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b156066-a6e8-47df-bcbd-13f757cb788d/zufokefigajanatonex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84f54d6-813c-409d-b6b1-1c6904f8a9c3/dance_music_manual_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6b3770-0d4a-4a25-9194-f16c74381a2c/78227100655.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/criss_cross_crash_90s.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_off0000704e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 5668 bytes
SHA-256: d0c862b61f697dc5ccd0ccf4853bf4ae5d2986deee21c83d2355299a28e14046
font_01_sfnt_off00008373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 10352 bytes
SHA-256: ced38a46b48563a2f6c5f86231af86ee40c5f8cc65739d455384dab8ff6917a6

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