Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d4dcd4e8baea8…

MALICIOUS

PDF

43.3 KB Created: 2020-11-06 19:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e2aefe426e9a046f8d0e6ccdc5245d07 SHA-1: 21ea5d0791b103d7ad97fb2077ffd7b8952d02f8 SHA-256: 552d4dcd4e8baea88a18ea0c032a7bd7fce80e7cffba6eb9cf7d21c58acbb4a2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/123?keyword=schoolhouse+rock+parts+of+speech+video In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/5292014.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/1422636.pdfIn PDF document text
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/rudazetavalebol-diborarukawow-gezakisaji.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/ff3ef9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/zithromax_side_effects_iv.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/96750586529.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/genezirifimonazukafize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126247d6-a95e-40c2-8a9f-ee265fb28e2c/8_ball_pool_online_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04af08b-94ef-45c9-9163-678ebce5e336/62265034060.pdfIn PDF document text
    • https://virinumit.files.wordpress.com/2020/11/logodazexojonu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bevisemasika.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/zijenapixikelojulidalod.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/pigogutigebu.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_off00005480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5480 5468 bytes
SHA-256: 35bd08302c9c766874ffff9b489a323feda4b29ee07f8f67b239adb091b75587
font_01_sfnt_off0000671a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 10312 bytes
SHA-256: 611e672ea879c35d327cbb38f2a912c43451d85e868e4022561d7684720d2670
font_02_sfnt_off00008a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A70 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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