Malicious PDF — malware analysis report

Static analysis result for SHA-256 676036057a47fe72…

MALICIOUS

PDF

33.3 KB Created: 2020-10-03 01:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2803def5d37b778493507005627fea1 SHA-1: f2ecb48fca19147570142265823cad78cd19fe54 SHA-256: 676036057a47fe72507e3151366ed912932cf867025d1cf2458dc0182f2ec079
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on domains suggestive of a link farm. One of these links directs to known malicious redirector infrastructure, indicating a malicious intent to lure users to harmful content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=cset+study+guide+english In PDF document text
    • http://vukav.wonderfull.blog/uploads/1/3/1/4/131483337/bijasexot_guromexoneje_nopati.pdfIn PDF document text
    • http://files.precisionmowerpowernanuet.com/uploads/1/3/2/7/132710687/cefa0c3d.pdfIn PDF document text
    • http://files.wendigostoughton.com/uploads/1/3/0/9/130969226/1d91770faae5608.pdfIn PDF document text
    • http://files.friendsoftherosenberglibrary.org/uploads/1/3/2/6/132695329/rakipedolej.pdfIn PDF document text
    • http://files.thebutterbar.org/uploads/1/3/0/7/130776460/cebb616450e4.pdfIn PDF document text
    • http://pilovame.promisestokeep.com.au/uploads/1/3/1/4/131408024/5351ba967.pdfIn PDF document text
    • http://files.ultimatepokemonchampionship.com/uploads/1/3/0/9/130969480/2818164fe7e.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/1/0440/6408/0024/files/17966077157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3798/3388/files/kewuzoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4422/7230/files/wow_classic_call_of_fire_glowing_ember.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/kabawiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2102/0578/files/chinese_baby_calendar_2015_chart.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_off000049d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49D6 4788 bytes
SHA-256: 59bab215bb38bde3e9de96095b0c6b23e459fadf066237206f49dcc3d602a1d4
font_01_sfnt_off00005a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1E 9040 bytes
SHA-256: 7913ab461422563f2c1bc91f4acbe639b42ad0f3f71f81bf8064d2be2f52d6f0

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