Malicious PDF — malware analysis report

Static analysis result for SHA-256 87270b497eec317c…

MALICIOUS

PDF

42.8 KB Created: 2020-07-09 12:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9257568d40ee49047031316e6decd99c SHA-1: 210ac4fd47a70e548e7ec1802eb6f0cabd1753f9 SHA-256: 87270b497eec317c666a7aeff9ae65e65fca22bbe6e9a651e3e7b7f9c5771982
192 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on disposable domains, suggesting a link farm designed to drive traffic. The document body and embedded links use the pretext of 'password protect pdf without adobe reader' to entice clicks. The ML classifier strongly indicated maliciousness, and the presence of redirector links further supports a malicious intent to lead users to potentially harmful content.

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://ttraff.com/wb?keyword=password%20protect%20pdf%20without%20adobe%20reader In PDF document text
    • http://files.xtratouchexpo.com/uploads/1/3/1/4/131483154/vijobufubajowete.pdfIn PDF document text
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdfIn PDF document text
    • http://files.healthnotwealth.co.uk/uploads/1/3/0/8/130874495/8ea4984.pdfIn PDF document text
    • http://files.moesoap.com/uploads/1/3/2/3/132302999/cf6696aef6.pdfIn PDF document text
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdfIn PDF document text
    • http://files.speedybraids.com/uploads/1/3/1/1/131164314/baduxo.pdfIn PDF document text
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdfIn PDF document text
    • http://files.learnerstogether.com/uploads/1/3/0/8/130874175/bezitojiritukup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://levejijuw.files.wordpress.com/2020/07/51813077585.pdfIn PDF document text
    • https://gakirebeb.files.wordpress.com/2020/06/somuxunupod.pdfIn PDF document text
    • https://lupevuver.files.wordpress.com/2020/06/guvowusog.pdfIn PDF document text
    • https://mudopepomof.files.wordpress.com/2020/06/32519525182.pdfIn PDF document text
    • https://parujekotazi.files.wordpress.com/2020/06/90465825254.pdfIn PDF document text
    • https://fexodil.files.wordpress.com/2020/07/riwenezajulituxumiwoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texojorigerusoxuduk.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_off000068ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 5220 bytes
SHA-256: 98ffc08a818db96e26a010b287d856d6c1f9eacbffe8068e1539d9739d6b486d
font_01_sfnt_off00007a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8D 10404 bytes
SHA-256: 222ae0de88d45f3eb9117c078553b652ed456dd3fbdd74cbaed2eec5c3d64ac9