Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dad16149fc6961a…

MALICIOUS

PDF

48.5 KB Created: 2020-11-04 00:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ecbeafd69d231c0338c52a1c25d827b SHA-1: 99e268dc4e35cd172e03f8affb738602a917f41c SHA-256: 4dad16149fc6961af5c358f34ca0e8880d649c4bbc0b268b7ad92b899241c035
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a prominent link disguised as a "hack" for a game, which redirects to a known malicious domain. This indicates a phishing or scam attempt, likely using a social engineering lure to drive traffic to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=pixel+gun+hack+without+human+verification In PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/lobufonaxozufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f93f7890c12a.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/2670b172.pdfIn PDF document text
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/92bc542c02.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/durigiguxiwukil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f8ce6a779fcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/50205204867.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/37242557222.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/discovering_self_motivation.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/psychology_book_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/9315071359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e96d6b-817d-4aff-b75a-62561e8f9871/vozezanadilatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93121c5e-fe9f-49fc-8b96-17321b7e3e16/nijeduzogirarugimudabida.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_off00007e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E43 5404 bytes
SHA-256: c46d6e9572ebc66af2895fff71ef058ec74fd4fe6507bacfc869067c089e2264
font_01_sfnt_off0000909d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 10504 bytes
SHA-256: 23a80b699752d34ff16fd0fc0a249d0341265bd1eb582a66a62dc5f215ce8040

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