Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c426748387e6b76…

MALICIOUS

PDF

35.9 KB Created: 2020-09-30 12:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ddfbc279156b0c8f12d274a56679d6cc SHA-1: 23a2004f58da6fc3824e178bb05e093b188cfc43 SHA-256: 4c426748387e6b76d2e30f81361ee928ed1e9d78fbfa0ba47bf1888f460ccc45
152 Risk Score

Malware Insights

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

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 0.9960

Heuristics 3

  • 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.
  • 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/strik?keyword=buku+osn+biologi+sma+pdf In PDF document text
    • http://gozujav.jaywarnick.com/uploads/1/3/0/9/130969895/fd1784388c972e7.pdfIn PDF document text
    • http://files.billyodwyerbob.com/uploads/1/3/2/7/132712127/895a54.pdfIn PDF document text
    • http://files.tutystenac.com/uploads/1/3/0/7/130775154/wujagejopamo.pdfIn PDF document text
    • http://bizese.canamepicerieendirect.com/uploads/1/3/1/3/131383646/fedbb827fcd55b.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/47917297785.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/jezabakubogunifa.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/11360232824.pdfIn PDF document text
    • https://site-1038872.mozfiles.com/files/1038872/16732227220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2610/6528/files/pisd_calendar_2019_to_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0282/0502/files/pokemon_sword_eevee_not_spawning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/catechism_of_the_catholic_church_baptism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6197/5971/files/63938250355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/android_stock_browser_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/dolch_sight_words_first_grade.pdfIn 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_off00005a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 5200 bytes
SHA-256: bccdc9cc3326cafe9c0c59f539b122b4fc98c49733a8549d067086f6fcceb12c
font_01_sfnt_off00006ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 9976 bytes
SHA-256: 183ba6ba9736827dcce8647a7178bd7c885efd93d378f51082e9732ba03968e4

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