Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c489740eca01b5f…

MALICIOUS

PDF

51.5 KB Created: 2020-08-17 04:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c24a9c37f411b3798636b25c45c01287 SHA-1: 31bbfd1c400a6d89c83645f40e078a45f2c90ee5 SHA-256: 6c489740eca01b5f6808c60a899ec34ae5333ca6d22bb5065968ddc5c7be42af
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a link farm designed to redirect users to malicious content. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true purpose. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=el+caballito+de+mar+informacion+para+ni%25C3%25B1os
    • http://files.madeleinemacmahon.com/uploads/1/3/0/7/130776592/9317283fb7.pdf
    • http://files.jackleesworld.com/uploads/1/3/0/7/130739430/902ce005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/office_administrator_duties.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9674/files/payment_systems_and_services_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/deratononumataneb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/wemuzavibavezu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/56598810786.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/66268455920.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/84977672331.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/main_badhiya_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/algebra_2_volume_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6962/7799/files/26926479460.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/medaninerikiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/89902200386.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/datebeduxixomux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/effects_of_public_speaking_anxiety.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_off0000869f.bin
e7c2a95ce9224c72ab2c03593fe4f14e58428247f9f8186dc891ace1b945c273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 5608 bytes
font_01_sfnt_off00009949.bin
747c898d3fc8940ca21fdfbc74715bdcb13b10eebdb00d120ba8623a94f1a278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9949 11384 bytes

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