Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79318419c278ad8…

MALICIOUS

PDF

58.1 KB Created: 2020-10-25 17:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e0c743c34612f9d6e510c12cc7860639 SHA-1: d861d6f55eedebf0c881aa2b1befa968f26f78a0 SHA-256: f79318419c278ad887d17dcefbe20cefab69de8c652317f104d80f478d5afa4f
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 0.9999

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://ggtraff.ru/123?keyword=gravitational+time+dilation+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_5f9019da5ff12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8e6a0d09f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5f8dbae6aba83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5f91600f76a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f87438e0d2b0.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/d2b09d6.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/forufeduruvew.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/pagoboxodozilak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56a99d6-38f8-4af1-96f0-71d8a6672b67/90378906776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518f8dd0-477e-4fa1-936f-ad6fa4984f4d/varotezuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e1542b-c444-40be-9204-b9482ec51396/gordon_ramsay_ultimate_fit_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d6e730-4d2e-4e1c-b04f-0f1a5c623394/90843265646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f9d548-24fc-4e19-b0fd-5c4d460d12b2/lugedimapabigipojapo.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/45254081530.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/motor_vehicle_bill_of_sale_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/burigulirobizamite.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/30272209851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a876a963-bc46-4eb7-9421-a652408117f5/15881423429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fb26bf-66fe-419d-8738-342bf8a9b614/65866859227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dc3f3a-eaab-4a73-bc20-6c43860ce044/beagle_breeders_in_ohio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/70845550776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/90801232897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2070/9798/files/esl_quiz_questions_general_knowledge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/bipazemiliketobuk.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_off00008ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB1 5100 bytes
SHA-256: 9bf6973647fbda1068e15ab99527183bc8b14415ac1bdd7a0d0e7fd5e2eb53b3
font_01_sfnt_off00009bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFE 12336 bytes
SHA-256: 1b05e201c20dc2bf96c5c4108a680a1b9e80bdff2be5dc3abc9afae4adb0ad2b
font_02_sfnt_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f