Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30497950cf2b6bf…

MALICIOUS

PDF

50.3 KB Created: 2020-10-25 07:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1b99bf50d9aedddca5b851b52a0ebb16 SHA-1: 9a7db4b4f07fa4eaa4b281e753881f46cc11dd79 SHA-256: f30497950cf2b6bf2bc7a0f5d8a94bf6347f271e6cefddc39d4791202c9723e6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as an exam handbook. The heuristic PDF_SEO_LINK_FARM indicates the document is part of a link farm, likely to improve search engine ranking for malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to malicious sites, potentially leading to further exploitation.

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://ttraff.me/123?keyword=adc+written+exam+handbook+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f93ce960c3d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87635a3e726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8d1122858e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5f928024a0c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f8dfc71b88eb.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/3193326.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/zunixaxujekak-jejerem-xeviko-zujiwural.pdfIn PDF document text
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/2906578.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/4353727.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/89c1dd5c-1a54-4b0f-87ad-bb1b2f607d6f/8079945177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4784f5a2-dca2-413b-b1ab-25a0ca4b2c0e/jipugixoxano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde84382-0a31-45d4-b682-97d72000d3a5/bidujoziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e47c8b7-ffd9-47e9-a403-a92331124272/siratulaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5290/3831/files/agile_white_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8206/5078/files/modatuwuruzerig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/87452353736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4807/9007/files/88507572691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1845/1609/files/navigation_gesture_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/whistleblower_complaint_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/barifogozunebal.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/9233123768.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ripezabinisifex.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/3160388961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3206/7227/files/83623696949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4908/5856/files/the_moonlight_dreamers_download.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A7 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000798e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 5596 bytes
SHA-256: 0b5fc0488be10d1833b762ba1bcb26777906ee4b789852b424e2f19a55dfa256
font_02_sfnt_off00008c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 2360 bytes
SHA-256: 37044c4548779c74067d79628d58b387c0439066134758d7211fb11fe1f64a64
font_03_sfnt_off00009735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9735 10480 bytes
SHA-256: 9f5f10a5d7e8d3b54206bafa347d18e1f9a18c64eb36102e76bb320f7fb99103