Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7c650a45ad924d…

MALICIOUS

PDF

48.8 KB Created: 2020-08-16 13:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f286329c4ed29f8c7b9f93ed249de876 SHA-1: 7bce56397eabdb0547fc10c490c06c6e88c44e2c SHA-256: 6d7c650a45ad924dd38cf3098f9803e8995d809c6844853de26f4a72980efb88
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a contract template, likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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://ttraff.ru/pify?keyword=free+consulting+services+contract+template
    • http://files.maristcyclingadventure2015.com/uploads/1/3/1/6/131637271/6f2c9.pdf
    • http://files.getbackpainfree.com/uploads/1/3/0/7/130776401/kudijanejekove.pdf
    • http://tojunipi.nature-myview.com/uploads/1/3/0/7/130738971/wanaxixol.pdf
    • http://lifegiti.kriswiltse.com/uploads/1/3/0/7/130738546/9064428.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/21374967970.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/febiwejazikabixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/xuseb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/71626516763.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/1305960408.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/sndrome_de_apnea_obstructiva_del_sueo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/zadevekejisimajem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/domujokovisinijagixudove.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/govobakud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/lagna_nimantran_patrika_format_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1878/8774/files/kanedapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/81670325829.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/zifimeviduzoligaxov.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/nj_homestead_rebate_2014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000754a.bin
88ddb54f3aaa7390d4a68e02e58db64466ec8a761a1757f84f1c265bbe117875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754A 5268 bytes
font_01_sfnt_off0000871f.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871F 2268 bytes
font_02_sfnt_off00009132.bin
066309977a2f0003fe849a8c1c14019747b879085ccb6bff7de55e3f2f2907ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9132 10624 bytes

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