Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea15a3d781cfcac…

MALICIOUS

PDF

44.0 KB Created: 2020-10-05 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3378e61dcb1b6a54e58163bfe530a9dc SHA-1: 7021078a61be6936b1489c7fe55427f95ec422d2 SHA-256: 0ea15a3d781cfcac6aa89e2754e03cd36f39d210b04250379dfac523f3de4a5d
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and redirector services. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content, potentially via a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=diablo+2+fire+cold+sorc+build In PDF document text
    • https://site-1037909.mozfiles.com/files/1037909/gixubipajafufewirixile.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/kipamufupariduzavisuwew.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/fajijoxitiwafiw.pdfIn PDF document text
    • https://site-1038384.mozfiles.com/files/1038384/49042554465.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/lanuwus.pdfIn PDF document text
    • http://files.livingstonkitchenshop.com/uploads/1/3/0/7/130739826/jegudivu-bowesuxoxivebe-forajokedegefo.pdfIn PDF document text
    • http://files.cdchphotography.co.uk/uploads/1/3/1/4/131483214/7780105.pdfIn PDF document text
    • http://files.jamietsax.com/uploads/1/3/1/4/131483279/6445153.pdfIn PDF document text
    • http://zawova.amherstyouthfoundation.org/uploads/1/3/0/8/130814328/4622347.pdfIn PDF document text
    • http://files.crescentbaydollfanciers.com/uploads/1/3/2/6/132695492/aad70.pdfIn PDF document text
    • http://xozulexa.mclewis63.com/uploads/1/3/1/4/131406650/zutomejovixufewo.pdfIn PDF document text
    • http://tagidor.kansascitydreamkeepers.com/uploads/1/3/0/7/130775350/godoro_dusonususuvibe_jafuwisafetuv_lenuro.pdfIn PDF document text
    • http://wosirexag.beccaspeert.com/uploads/1/3/2/7/132740594/zisisuxupubidonasemo.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/gegobosopopazak.pdfIn PDF document text
    • https://site-1045368.mozfiles.com/files/1045368/47239876814.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/10540940818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B06 5284 bytes
SHA-256: d4a312e123021e6489bb77ea91e7492f592ee800257d0c0e1a204157057a36fd
font_01_sfnt_off00007d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 12260 bytes
SHA-256: 58443e9baaad17381e571e9a1312f3fd92c4d909361fb15941869743a2fda153

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