Malicious PDF — malware analysis report

Static analysis result for SHA-256 224dbbff5a74cdff…

MALICIOUS

PDF

51.1 KB Created: 2020-11-05 17:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4bc9eb4d0a66e1acd7c01023af1dc87d SHA-1: 3bd33b7fe06b13a17a515b4ad350a811b86167a1 SHA-256: 224dbbff5a74cdffca6198d330aa04a7c792abce473394a7008768a1bae8079c
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 large number of embedded links, many of which point to other PDFs, suggesting a link farm designed for SEO manipulation or to obscure malicious activity. One of the primary links redirects to known malicious infrastructure, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=vplayer+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5f9a6591c3cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f9379f35a050.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/xitinuragowof_lurute_zimagekidi.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/fesepolodege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f8ccb37ac5ba.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/mawafukutopopomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fa28b28baacc.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/7490953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jolituzoji/tamiwoxadazosufowisufoteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0000449b-97f1-4ff9-a00f-823af7cf8684/book_review_on_pet_sematary_by_stephen_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261f8124-f295-4e26-ab2a-58c04a569da4/lesbian_sex_toys.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654C 4660 bytes
SHA-256: 7a259486f8ecb6ffc4c11b1168fbe225bf9c96ed5273b0cb82bde66866ec0793
font_01_sfnt_off0000753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 11196 bytes
SHA-256: 44f5a8695a1b51798f9e4946d6e0875bdc83cd97fa7b3e7c6b2864ff037f1e96
font_02_sfnt_off00009ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA6 16376 bytes
SHA-256: 689353b77efb0c85eb405f3d24523f5adbe74cc9d28762e0f9abf03a58fd6ca3
font_03_sfnt_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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