Malicious PDF — malware analysis report

Static analysis result for SHA-256 511f5adeb08a99a2…

MALICIOUS

PDF

42.9 KB Created: 2020-10-26 16:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fb40cd0876f0ea286b464ff8460acf9e SHA-1: 20815cefe0ef663e068d87dfb9bdc0be0a4c325d SHA-256: 511f5adeb08a99a2c18ff7109cfc819de4275d8acf35d89b4c1e8dbc042dbeb9
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=writing+prompt+worksheets+for+6th+grade In 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/1/0482/6700/2020/files/shine_jesus_shine_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6425/2821/files/kosoxudumewigepusar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1370/8182/files/battleship_game_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/whatsapp_apk_download_versi_baru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/zemuxadabuxij.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/medical_microbiology_mcq_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/negikuretuxusolewosogegup.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/41534234578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab08f6a-e10d-4105-89b0-806ac69b59c0/assessment_guide_houghton_mifflin_grade_5_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514aea82-76c5-48ba-a2e3-39520d91511a/fujuborubovuginema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5976c3-175a-4aa3-bf68-58506baf0222/48429281007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911210aa-6a5e-41b1-bff3-1509013eb5ca/ripunogagunabawuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62402dc0-8ebd-4a33-9543-55b396a704d6/96873074044.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/antrenmanlarla_matematik_3_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/msc_zoology_syllabus_download.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/asturias_albeniz_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/35565757742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd35e20f-dc7e-48cf-848e-d5711a666845/sumokopedugaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef33678-5b9f-459d-a2cd-73b140105f4a/kujame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fdd7de-7399-4fe2-ab8c-3867d40ab7b6/doluzoxovepobelugufex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11fb636-30da-4f98-a52d-62e26d0931f8/nevuzosogugofarog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018fb5ed-98c4-42a2-8aa9-d86d9814e2c4/dont_give_up_peter_gabriel.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_off00006846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 5748 bytes
SHA-256: 0da4b04b40af5b0398a62fe7060e54ddac4218d9adbeada55710e1d2a370a354
font_01_sfnt_off00007bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC2 9984 bytes
SHA-256: 6ef713396b9bf237b26a2446246c9e7dc9a8d212e0e2543a9eeb16a5503b2070

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