Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd61528a074aa1f…

MALICIOUS

PDF

48.7 KB Created: 2020-10-14 02:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8fb607047dd249ba5ac851090a77c886 SHA-1: 729aa1e974c91a491b2a7c8ec7522b5b6c79ca17 SHA-256: 3cd61528a074aa1fdfb295ce391ac446dadfe62b6d65280be056290b020a256a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lure users to malicious sites. The document body also contains numerous links to Shopify-hosted PDFs, suggesting an SEO spam or link farm tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/strik?keyword=bescherelle+la+grammaire+pour+tous+pdf+download In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/duwivif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/roberavimipuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/wuworegimikeroxogeledi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0467/9576/files/19329781537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9951/5816/files/zoxukomiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0301/5078/files/do_you_want_to_build_a_snowman_easy_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2484/3420/files/zenonia_5_mod_apk_offline_free_shopping.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8842/2067/files/furniture_at_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0449/2438/files/sonoran_desert_cactus_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0046/9403/files/80982831904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3232/1431/files/the_seventh_man_haruki_murakami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1989/4425/files/how_to_play_riddle_school.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5592 bytes
SHA-256: 1eebe1c34daf168ab979b36a42291d574506bb9e8fca375dc0f7ef0d83e558a6
font_01_sfnt_off00007d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D54 12724 bytes
SHA-256: 85ae5fbe091a3cee94be60f76c8cf06f6e782004eceda3cfdbf3e354f2454779
font_02_sfnt_off0000a5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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