Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f821260db4a5f5e…

MALICIOUS

PDF

56.7 KB Created: 2020-11-02 08:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20cd1f1aa5a7f5c0f9153464bcacf41d SHA-1: d1c2ef384e63dc3f2a4731d3da5aa375ea96fce8 SHA-256: 7f821260db4a5f5e15b4935d9057e8d32c02d7b58813f31de2659fa458f01a97
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://gettraff.ru/strik?keyword=best+ceh+v10+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8be012ec087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f9f118144c77.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/5522b941-3ffa-4b2d-bd69-587628df4784/wulawovisoragobumufolego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e4d3f0-af9e-4daf-bd88-320f40ed5c3c/consulado_de_mexico_en_san_bernardino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6403/2925/files/implementation_project_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/warframe_eidolon_teralyst_kill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/66583936642.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/2132378881.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/college_board_sat_2_us_history_practice_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/stamp_duty_land_tax_return_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bixumiburi/mijogabokewejevoru.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/terraria_calamity_ankh_charm.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/8605736370.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/21878218243.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/20905285339.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_off000088a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 5268 bytes
SHA-256: 38926573c26c245ea3b22624005c06ab6b7ee026e27e0c4932d542a0d071a87e
font_01_sfnt_off00009ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB3 11148 bytes
SHA-256: 02ddff15b5ddcec8998d601fd1150dfb37ee74b1fd31fffd1fe4d8570e27e68e
font_02_sfnt_off0000c08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08D 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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