Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aba8b3a57bb9d1…

MALICIOUS

PDF

43.7 KB Created: 2020-10-19 16:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3983c6fc1d16d700e79c6283e7e4564c SHA-1: 2f53ae8170583914496e86eca89be7a41cd204b4 SHA-256: 41aba8b3a57bb9d17567ba8c1210d53669f65633a7607fb040f1df75ab37aa17
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and ultimately redirect to a known malicious URL. The primary purpose appears to be to drive traffic to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirector and link farm.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?keyword=american+english+file+1+second+edition+pdf In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/tebin_xutobutavixago.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/3331982.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/1702290.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/woxakimuv.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/semujibapi-zixug-duxux-laxasufojikaxe.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/dugigen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f888520ddc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f89510adf550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f8881ff4c9ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8972e44f1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8bfe06acb59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/80245097024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7814/6462/files/3449457007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4669/8649/files/2017_amc_12b_cutoff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1518/3777/files/14616522920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3279/2216/files/stickman_hero_2_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8446/8390/files/bonolota_sen_kobita_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf52418-5a5b-445f-9a15-5a5a484f5cc5/2329888602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b010d92-dd3d-4122-a948-d04ffa8512f8/lasixosijogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b85be24-fe8c-46dd-b497-a67e46938a79/sokatuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2730c565-0ed4-4f53-820c-ab5c8ffc4341/sobidisojamirewakimi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E57 5612 bytes
SHA-256: dc8a0f9b2ae852c282512ddada5b0b75da2ff6fd06c68f8b431ae6429e344f68
font_01_sfnt_off00006137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6137 9448 bytes
SHA-256: 7cd009403f6a2210fa134d089dac50b04d522257635c4d40c708a15eea43356a
font_02_sfnt_off000081bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BB 18444 bytes
SHA-256: ad81aafe3b0e554dfe93c63589d3b7ab9b7c78485d38523de6ccb9ba617b8600