Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a7b459b2367adf…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 06:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0aff93c57d6280099de28cf58ec90fb SHA-1: 1afb638dc978f32d338af7a89bd88d497557a6b2 SHA-256: 66a7b459b2367adf80f12ca6ad83161aa4a2e97d00c783878d045586cc3ce479
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for educational notes, suggesting a phishing or malware distribution attempt. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the malicious redirector.

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.com/pify?keyword=biology+form+4+and+5+short+notes
    • http://files.feedmeupdelivery.com/uploads/1/3/1/8/131871849/dunugefubiwexixe.pdf
    • http://zibawinif.simplelifecitywife.com/uploads/1/3/0/7/130775085/wubasal.pdf
    • http://files.ecpizzeria.com/uploads/1/3/1/4/131438784/pitebopeziw_fovelibovolusis_kejotup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/basubaninaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/vujokazav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/vazewoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/47665240666.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/colby_sawyer_moodle.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66691602327.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/cry_my_beloved_country_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/bepulodefovok.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1285/files/posisuwivoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/benodisedonamugavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/jejitotitizogabasawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/ronotazumevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/bawovodop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc5.bin
cf047da45dacfa6a2731774e67df7838d73f7c5526da13d409267aa7d1d36ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 5684 bytes
font_01_sfnt_off000072fd.bin
8fd606bc01f200a56f8d8ddcbd0e7db67b58d457e0f135a03401b184cdffa43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10308 bytes