Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5c5c49060c353b…

MALICIOUS

PDF

39.8 KB Created: 2020-11-01 11:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b087142e3b7b21864c3ea7c222e489ef SHA-1: 2eb9d22dba75e3ef4156d6364e849e17d4c35e53 SHA-256: 3b5c5c49060c353b678fe41ba21be13d7702604bb0d57d44ac751c75b11414b3
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and a link farm, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to redirect the user. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=stage+4+tongue+cancer+treatment+options In PDF document text
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/lowisozi-xufob-ximig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f9aa4de7adbd.pdfIn PDF document text
    • https://zowutopukanujim.weebly.com/uploads/1/3/4/2/134235103/limuxuni-rirujak-texebaw-badokaxobawik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f9a4bf0ef81e.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/dagovirowar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5f99ec7320d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f9c4ede278a2.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/xovitenipomexo-bisewurojuzipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f9509e2c0ed3.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/120f3817-68eb-4e06-9ec8-abb4ca489e5b/jopopigidodozodujugak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3838d0e5-7afb-49a5-b510-9df801845051/47215113758.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/rogers_park_lubbock_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/97001469133.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/module_3_study_guide_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE8 5412 bytes
SHA-256: e120f9138bb8ba7233c14a6dc0690a5dce7817ec7acd330ed0ebf5aa1beb7bae
font_01_sfnt_off00007044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 9792 bytes
SHA-256: 77ebe83681bfefc98bfca7e553253906786b86e9ab20cd946de4e4ff16180334

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