Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbab2ca8d944d3f4…

MALICIOUS

PDF

37.5 KB Created: 2020-10-25 07:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fd9c9477862fbb957e6c4b51d525632 SHA-1: 3314c6379f1247120fd15d85ce6d24cb04604f4f SHA-256: bbab2ca8d944d3f45480ab263bc8b76aa2183b87d707e9dc500b9f0d6d07f146
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This suggests the primary purpose is to redirect users to a malicious site, 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://cctraff.ru/123?keyword=succeed+in+toeic+10+practice+tests+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f94bcab62907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f8b57b204763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f91c7a6be239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f94b34beba4f.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/c38da946-8f18-4497-9bd9-d21ba316fc04/venexiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fe2543-0135-4dc2-8d23-f6dc96ce3bd4/ayat_ruqyah_pengusir_jin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214bcb08-2173-4f84-84c8-94c3acbf1932/dasomewubekifepir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3160/8487/files/briggs_and_stratton_2550_pressure_washer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/kunotuxofejabinikizosiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db080cf0-44d1-4567-ba63-5f4ae5e85a84/wulutipulazesivuwikoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13f2e2c-88f7-43fc-8feb-597d1b259512/jibazuvusobexifanobil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819b41fa-d95b-464f-bb72-455df6951bdc/practice_makes_perfect_english_conversation.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/5254929781.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/tenusetoseroloseziwot.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tuwopibojiba.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/93710220246.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/70535789121.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/tebakemikuzanivinopa.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/58146143260.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/bridges_math_kindergarten.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_off0000530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530D 5412 bytes
SHA-256: bf534069826d2bcf56dbe12b6436ef3de738d84c593055ad4e31656fdc97c4e8
font_01_sfnt_off00006588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 10216 bytes
SHA-256: e5afb9320664dc07b0488328847ced72f9358b114e31b5b093efe3f072869ceb

Open this report in the interactive analyzer, or submit your own file for analysis.