Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1a48edaee6f2ae…

MALICIOUS

PDF

43.3 KB Created: 2020-10-29 08:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5d4ee3ae4cd1ad0a3988cd5da39abe65 SHA-1: 316507eb370148d5b239be47c50a3fc438d8e82a SHA-256: cf1a48edaee6f2ae5a4d897d43370edfddbf4635a12fac0fce9d2e76dcacadd6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=house+of+dolls+pdf In PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/guwijamovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8e0dff22ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f96b76f32779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870af12352c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5f9a2b4365e60.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/8203441.pdfIn PDF document text
    • https://sowubewakojanit.weebly.com/uploads/1/3/4/3/134348505/marider.pdfIn PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/3a8677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8b4ccad399b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f930a992e2f7.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/buzuwopuduxiremomoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f88af45a5f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f901cc8a5aa9.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/1/0501/0928/4515/files/xivatovetaxalojepiwemax.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/17829461456.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/peraxani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8552/8732/files/mullen_nebraska_news.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/66384069433.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_off00006bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 4688 bytes
SHA-256: f8595e312f24c1bc6c096fa37b47711b7226169ca698f87632088f9ee283e7cc
font_01_sfnt_off00007bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 10816 bytes
SHA-256: b16d8c0ed6b7aa4b820df76a6492843308e7dd8c339ab5be394a912f7b83243f

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