Malicious PDF — malware analysis report

Static analysis result for SHA-256 02598bcd8461814d…

MALICIOUS

PDF

42.9 KB Created: 2020-11-09 07:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1399ec8f4c675a975262ae9788262a66 SHA-1: 3d71d91f736abda6fa422b526d2425f140493cb9 SHA-256: 02598bcd8461814da2b7b1ac44e17c428402879f0b43c6904ae66af5f712b397
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links points to 'https://trafffi.ru/123?keyword=st+martin+s+guide+to+teaching+writing+pdf', suggesting a potential SEO poisoning or link farm attack. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of external links points towards an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=st+martin+s+guide+to+teaching+writing+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fa20f3ae78f7.pdfIn PDF document text
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/7100525.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/cc8adff020613.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/tetenifeme/buffalo_ridge_elementary_wyoming.pdfIn PDF document text
    • https://wojuzuw.files.wordpress.com/2020/11/melapezemajagozejezafutil.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/plants_vs_zombies_app_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/20562001678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f972bb6-2be4-4326-9aaa-fb4dd236df0d/linafujekimunilo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/jiwasavabexanulomaveta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b746c7-24a1-4dbc-b8ef-98efba58423e/7152505197.pdfIn PDF document text
    • https://finasaz.files.wordpress.com/2020/11/asus_zenfone_5_ze620kl_android_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/matchbox_4-level_garage_play_set.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/application_for_tc_download.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.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_off0000677a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677A 5732 bytes
SHA-256: f620f152cbe76c48e25563f5423e04185aa7df5d7ba1c8b8ee263e9257ce3838
font_01_sfnt_off00007ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 10360 bytes
SHA-256: 272ebd206f75b874158fb09c77f21521fdae5c772c5337e7abe10a3ba9c0cc02

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