Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fe292c12770c13…

MALICIOUS

PDF

40.3 KB Created: 2020-10-31 19:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 99a2b1f8918a80d784e718ae001b834a SHA-1: d24a366c91fd47acef492f0eaa51cb0b9351af4c SHA-256: 99fe292c12770c130d0144699587d424449517451f3fb2c43dde335849e950cd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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://gettraff.ru/123?keyword=kinh+vuc+sau In PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/5400807.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/2111198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5f90f91a39356.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f91d3e864d9a.pdfIn PDF document text
    • https://femodufawo.weebly.com/uploads/1/3/4/3/134317846/zexagove-wijobuluxuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1522/8570/files/dagizibexudunebinegoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03ca410-2461-4ebd-b5d9-1673c3c4d381/golekem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/18673328725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0d72de-dc4b-48ee-8c90-61853080aa04/rotazugog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0509/5368/3131/files/35442988206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0173/8926/files/wudulolidugidomesiwug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/5575793116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6698/1013/files/char_broil_infrared_gas_grill_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5349 4360 bytes
SHA-256: cdf2f0b4099660ceba49c726dcbc686ae81e04a0287140748bc3b6f0db8aef49
font_01_sfnt_off000061fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 11640 bytes
SHA-256: 9706b863b1f85a5aeb72cc4e60b5a92563e5cd6c5de84be962ed1ff27b7f59f8
font_02_sfnt_off0000867e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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