Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6f7e270ac448da…

MALICIOUS

PDF

50.8 KB Created: 2020-10-28 09:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1e92c76b5583f5543289f654403c599 SHA-1: 2b8ea17353a7cd05d00a5325606e262547987754 SHA-256: bc6f7e270ac448dab0e8cf216b3c652fd543ee77480c8847df78b1e7ceaa68f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/strik?keyword=units+of+shear+flow In PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/tubobevabadukuw-muxiwamufase-jugunotupe-dibagaki.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/joriluputoguvutomot.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/3007ddf5a63655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8ae9bd316f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f93a7fa6fe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_5f98a68fb0e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f8fcdcb21248.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://s3.amazonaws.com/memul/acidic_character_of_phenol.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/84815840957.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/criminal_law_and_civil_law.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/java_programming_language_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/aranjuez_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00b1878-6aa7-46f5-82e5-f5004a5110c9/895116541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264c25fb-e75b-4993-bd33-4cdb6ecb269a/44174931640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b236b3-f6bf-45e9-97e1-f8bde002fb6c/kalikuzagimabuwebegep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c7f874-1e57-42a3-add3-71e8ad3a4940/guess_the_emoji_playful_level_56.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b4b9e2-a202-4010-95b7-790a24afaa72/cemu_xbox_one_controller_profile_dow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/36100181868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4568/9765/files/27353899601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7740fdba-95ce-40bf-ba6c-21d148fe15aa/rujogigakon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578f2f25-a8a5-43cb-8f8e-6a40cc0fe230/20985557714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4790ff-c57c-4786-bf4a-8866f0fc12de/naregim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d42aa7a-010f-4b07-8b9b-3b31db11db8b/44008315572.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 4724 bytes
SHA-256: be1ac3069e2f3ada557c92a80af07840c6306285735128cece3ea74c8c977e1d
font_01_sfnt_off00007334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7334 11120 bytes
SHA-256: 208ac1b8fb2269a8bbf924a236e7d730ad8bc0517c8729bdc60d5ce6854a2fed
font_02_sfnt_off00009922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9922 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399
font_03_sfnt_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f