Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b8393d912cf9b6…

MALICIOUS

PDF

47.6 KB Created: 2020-10-09 08:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f41c0e53751b5af622652dbca7ab55dd SHA-1: f26bcec218ae99670c1dce004d61a2356a22ea94 SHA-256: d9b8393d912cf9b61e2999ef9afde145a604d85635b5a7e2843104d65e8ed9e1
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic suggests a deceptive user interaction is intended. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, reinforcing the malicious link redirection pattern.

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.
  • 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://ggtraff.ru/pify?keyword=clark+county+jail+roster+vancouver+wa In PDF document text
    • http://files.napavalleycharterbus.com/uploads/1/3/1/0/131070367/9800303.pdfIn PDF document text
    • http://files.inspiora.org/uploads/1/3/1/4/131407135/rarenuvokukalib-daligugakof-dumol-mibawoxiximow.pdfIn PDF document text
    • http://lujepa.whiteoakibc.com/uploads/1/3/0/8/130814575/migapuvoxudag.pdfIn PDF document text
    • http://ropoxe.apostolicadventures.com/uploads/1/3/1/4/131453005/xujulogetepufo-punejukuxi.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/1/0433/8001/5271/files/norwalk_hour_obits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/kalexerejunebopezevapage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3467/2294/files/shalin_liu_performance_center_wedding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5692/1256/files/imagen_de_gatitos_tiernos_con_frases.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/73430983745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3121/2444/files/what_does_x_bar_mean.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8080/0663/files/bsm_desynth_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0682/8959/files/lesson_3.3_practice_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8268/8928/files/tci_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/jovijojepunukepupogotuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0644/1125/files/solid_rider_2_poki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7622/1096/files/64301930004.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_off00007b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B64 5092 bytes
SHA-256: e855a323f56f801a784e60008fb85066ee7ba7e6962bb72d9995ce59556dea1c
font_01_sfnt_off00008cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDF 10740 bytes
SHA-256: fb82be9bd115d99271ab0bb6ab6f0e7fcc3fe97f6a0c248e42fbda76afd29360

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