Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5ad35db7a4810b…

MALICIOUS

PDF

51.0 KB Created: 2020-10-30 00:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1208f36ebb0f7d854221bcfcd68aa73d SHA-1: 174ef148741e8795b8ca910c2a06c898747eec35 SHA-256: 7c5ad35db7a4810b1c8ae0c1aa011d18e818b1a03ab3a075dc349495c553232c
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to direct users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The embedded content appears to be a garbled representation of search results, further supporting the lure-based attack pattern.

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://cctraff.ru/aws?keyword=david+efron+electrical+engineer+nuclear+power+plant
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/satedafadusizo/fur_elise_piano_tab.pdf
    • https://s3.amazonaws.com/besafefaf/volisevolidatovekikak.pdf
    • https://uploads.strikinglycdn.com/files/1b7b3c24-6660-4264-98a0-a1f090104e60/notavonozojubo.pdf
    • https://uploads.strikinglycdn.com/files/b8d0ddb7-d766-47b5-9c2c-942512a22dd9/36270069939.pdf
    • https://uploads.strikinglycdn.com/files/e287cc12-cece-4b06-89f1-aa5ee39a2e44/wowukaz.pdf
    • https://uploads.strikinglycdn.com/files/b22fe688-ae99-4e63-aed2-b288f9f8654d/52409431168.pdf
    • https://s3.amazonaws.com/wenobagupexekap/lepapopunijemagutoposaja.pdf
    • https://uploads.strikinglycdn.com/files/364c8048-8f8b-45ed-9475-385b6d1ed0f1/26766594001.pdf
    • https://cdn.shopify.com/s/files/1/0498/9822/5863/files/piaget_theory_of_language_development.pdf
    • https://s3.amazonaws.com/zetare/klasifikasi_acanthocephala.pdf
    • https://uploads.strikinglycdn.com/files/a2941bab-e417-46cb-8171-6c018a65a489/binujejelam.pdf
    • https://uploads.strikinglycdn.com/files/8c5ea22e-d69d-4745-a9ea-de878479fd09/61764775837.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f15.bin
82f8b1b9ded7cedd0a37bfb02ea98a24325c51feb98a6061366bc7374c7112c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 5176 bytes
font_01_sfnt_off000080d2.bin
cd143c66147c24b0fc9329e2c3fc80dddae98fe83db689c78449e715ec780a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D2 2576 bytes
font_02_sfnt_off00008bf0.bin
81f6703319a46520c1d51cf3bdc96c5281124720740cfb9f8f72f9176c976638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF0 10612 bytes
font_03_sfnt_off0000b019.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 4324 bytes

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