Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fc9f643d5a3dd9…

MALICIOUS

PDF

46.4 KB Created: 2020-10-26 05:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1a9aee388732efcbaf8a097fad9d717c SHA-1: b8601df63e62795c29110c594dac157ce04e7e46 SHA-256: 83fc9f643d5a3dd90506006292ab174eecec249700f3e51de6dd70a1bca87304
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a link farm and a direct link to a known malicious redirector infrastructure. The embedded content, though obfuscated, includes the malicious URL, suggesting the document's purpose is to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed to distribute malicious content.

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://cctraff.ru/strik?keyword=short+reading+comprehension+worksheets+7th+grade In PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/dagaruzizuwiganup.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/fefujewetawasozokadu.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3f7bdb1fc.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/bikalepi.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/joxofoz-puvitogegexode-dowasiveles.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/loxotudo.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/pulod.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f87b772110ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8c4c0f7819b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8710c13aa44.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/0ba6d238-88af-4a28-9e9d-9bd009e310ff/tiffany_thompson_bruises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9cb0c7-c9d2-4e3d-8701-c5d3fac9aa3a/6359068703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001fc435-6f1b-41ba-9d16-e55614cd0449/bogadirawer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3478/6971/files/diablo_2_like_games_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3008/3248/files/readers_digest_diy_manual_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4595/9845/files/85833312351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7672/1051/files/xokasebivokiferewes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7922/7805/files/11758455406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8013/1759/files/fma_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/zogetefiwutarob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/tuxetutixunosako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2791/3640/files/mezcla_de_colores_para_hacer_amarillo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/altivar_31_inverter_manual.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_off000073c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 5796 bytes
SHA-256: 0de643dea56013469a0368407f6762530de00fe816202a9787f65b3534cba05a
font_01_sfnt_off0000876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 10660 bytes
SHA-256: 9ec59d5d2cfa95848f3d036fa778a633612801a45a90ed3d85d6900dc03f6a16

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