Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d8ac320ecad0c6…

MALICIOUS

PDF

79.8 KB Created: 2020-11-09 00:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9dd2b8805334a8d614165257c1cd5ba0 SHA-1: b8e759909650ea4bb997e9b2c07a0241ada45399 SHA-256: 07d8ac320ecad0c60958d4796e8278c8c66d81712ce658f0b18477cd1a6e4ae4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent link disguised as a manual for a weed eater. This link, 'https://trafficel.ru/123?keyword=manual+for+hyper+tough+weed+eater+h2500', is identified as a redirector likely leading to a malicious site. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?keyword=manual+for+hyper+tough+weed+eater+h2500 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461763/normal_5fa7e06351a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fa4bc17c9681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fa1c218c6f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5f9accdd0d600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f8a28ff53ee3.pdfIn PDF document text
    • https://tolazekujulom.weebly.com/uploads/1/3/4/6/134668849/vakipa_boraboro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_5f9e4d54321ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fa16a6a0ca6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5f9edd7c47642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f9784e6987e5.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://mepugen.files.wordpress.com/2020/11/ap_statistics_investigative_task_chapter_4.pdfIn PDF document text
    • https://nilekaze.files.wordpress.com/2020/11/nier_automata_city_ruins_piano_sheet.pdfIn PDF document text
    • https://xejozowezan.files.wordpress.com/2020/11/68301303527.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 5556 bytes
SHA-256: 4ceaa0a90c148de32a8707f1890bcc837f14d45be176f324789d6034e863f0f3
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 14564 bytes
SHA-256: 8d60a4252ee4778a661a5a6f327e51ebf0f6fedbe686926d8cf8c6cf599c8185
font_02_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa
font_03_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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