Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4551a31b4e9f7d…

MALICIOUS

PDF

39.4 KB Created: 2020-10-28 01:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 15f0b434dc04bdbc3b88da189d4603dc SHA-1: 1ee7b01a7b5a5ef08a2db587a4f0ca7d5abaa575 SHA-256: 4b4551a31b4e9f7d6362b485c492f90baf9daf293ac09073da9683c80e4d3f94
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://ttraff.cc/123?keyword=harrison+county+board+of+education+cynthiana+ky In PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/xupaba_zizidapidogox_suwopugajebo.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/noxuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f87e40fcbd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f90a71a656e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5f8caaee0d63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874b6f97a9f.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/af96892a-ccdc-4909-b3ca-e124390280b6/mezugagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95e8528-6c83-4578-8f6e-790975518e99/under_the_double_eagle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3599d8-d5d9-482f-a3e9-ed75930ac1a4/xomegosadipajafalukuzabop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be6843d-8582-41a2-8737-37c5ac118342/unturned_betting_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b346f1-3034-4f8d-8889-408f8f3a3ebb/12880448182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2951/9272/files/vebumejegutokowizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2571/8184/files/apk_xhubs_sfile_mobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9335/5416/files/genki_2_second_edition_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7971/0905/files/94411249136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9603/1391/files/54617963964.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/ateromatosis_aortica_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/polar_and_nonpolar_solvents.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/marathi_bhakti_geet_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/algebra_and_trigonometry_6th_edition_robert_blitzer.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/ajax_tutorial_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ncert_environment_and_ecology_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/bevel_protractor_least_count.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/29387337381.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_off00005af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF8 5344 bytes
SHA-256: e35626c0c54d613afa00e75ba464d9b69bfd31a90012bf8a00469011543ec506
font_01_sfnt_off00006d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 10232 bytes
SHA-256: 3a7edee549b6236b45839ac9471b88946973da05054fc0171f7af2138f6ef252

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