Malicious PDF — malware analysis report

Static analysis result for SHA-256 c532fa099803b87d…

MALICIOUS

PDF

42.9 KB Created: 2020-10-27 12:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0c48cf89845e1c7d658352ca29109fa9 SHA-1: de81def9b12ea96253354b3cfa8c7373c11022d6 SHA-256: c532fa099803b87d7184d14af86a2d0efb25567162ca506953f622c6792b90d2
184 Risk Score

Malware Insights

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

This PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to a redirector service. The document body contains obfuscated text and a URL that appears to be part of a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent, likely related to SEO manipulation or phishing.

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/strik?keyword=%253Dd8%252Be8%252A0.5+is+a+complex+formula.+true+false In PDF document text
    • https://gowosupene.weebly.com/uploads/1/3/4/4/134489802/137f82.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/2382560.pdfIn PDF document text
    • https://jujarodi.weebly.com/uploads/1/3/4/5/134507231/2323899.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/5901722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5f958a87c78ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f924a34db08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f94ce7a1492c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9531ea6c452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f87adb943616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5f8e79ee5f749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8affe2ac30a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f8ecd5c38967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8f43fcc6803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f87247225200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/pebejazefonodorokiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/josexag.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/biology_class_11th.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/tikiduwogopejewaxujobisu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/67672592430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/5224/7461/files/suxukeraxizikotojotilunuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4109/8398/files/albert_gallatin_high_school_address.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5033/1043/files/apk_editor_pro_download_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182d44eb-aa03-4192-ae0a-1c0d185cf36f/apology_of_socrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b4451d-0592-4b67-921a-6e1d2a346dd1/10273759044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebbeaef-d45c-4968-bbed-33ae8c9491fd/36880403157.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 5880 bytes
SHA-256: 928cc320592fe3088ad272ce5ef2c993655359845b2cb66053d232774a6d1f03
font_01_sfnt_off000076e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E9 11720 bytes
SHA-256: f42c8bb3eab1cc21c2904664185757e54ec2eb82a8959577c8b5ee5b531c07b3