Malicious PDF — malware analysis report

Static analysis result for SHA-256 471fd833ca826d80…

MALICIOUS

PDF

54.2 KB Created: 2020-10-26 17:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c80bd7c2a5ebf060bed9c25ce76cc98 SHA-1: 1fc121df84475676f167dcd294bb7345a7fc2287 SHA-256: 471fd833ca826d808520a1b6f3787d57c8ba64d78a7fc3c19385421ee186ca38
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as part of a malicious redirector infrastructure or a link farm. The document body, though heavily obfuscated, contains a URL that mirrors the heuristic findings, suggesting an intent to drive traffic to malicious or SEO-spam content. The ML classifier also strongly indicated maliciousness.

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://ttraff.link/123?keyword=sociology+solved+mcqs+pdf In PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/1d82739f20a.pdfIn PDF document text
    • https://jafumusatezod.weebly.com/uploads/1/3/4/4/134485233/c113c.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/vukadizusediz.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/fewobis.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/vujibawefil-vozomodifate-sajobesiwi-bezaxexizomon.pdfIn PDF document text
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/sisexawal.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/6677827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f95c823b223f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8e40ea77ccf.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/1/0436/7171/5993/files/bikanolujizikizuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9333/4456/files/lavuwazafasimow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adab8761-a460-4193-85e8-d00d913aa2cf/gewawonulumeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da08c81-f50d-4b26-9ca8-3cd92dc5be60/norawo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5043/4211/files/a_ripple_in_time_quest_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0786/7037/files/star_ocean_second_evolution_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 5560 bytes
SHA-256: 01456bdd6f429bf62bdc9aba2842e827a84d7463c879de5d4ebf7955e709b35d
font_01_sfnt_off000085fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 13388 bytes
SHA-256: 218ad75e30c323ed894c52dfb5b057b06d7763a0ef0d038e588d8558e2e2444a
font_02_sfnt_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 16968 bytes
SHA-256: 5a56f5672c21a572fe0ff01db71027b1bc005cef82d619756d553def8b02fe7e

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