Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e767404ef19598…

MALICIOUS

PDF

41.6 KB Created: 2020-10-30 15:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c93207020e15548ff458149a1a607570 SHA-1: 123578376044d3ad9f9ace47bba2253bc729b3e3 SHA-256: b0e767404ef19598bc9e3641df1cfaa90e633d6be6324e1476f25d138d263123
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a critical heuristic firing for a malicious redirector link, which is further supported by a PDF SEO link farm finding. The document body contains a URL that appears to be a lure for downloading software, and the presence of a 'download button' heuristic reinforces this. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=zenonia+4+offline+apk+with+cheat In PDF document text
    • https://jaxirifaru.weebly.com/uploads/1/3/4/5/134500995/gosumunot-wevawakexitol.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1901143.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/1/0495/4852/5735/files/singer_sew_mate_5400_c4_error.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/hello_szybki_angielski_dla_pocztkujcych_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/metajugopaxepuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f60b32-7102-4bfc-aa0e-8e95f603eef9/continuity_of_parks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e306f74-717b-44de-aac3-19a1c54b43f9/fenaxavejofuma.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/java_spring_tutorial_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364b34fe-8819-4fce-8b34-5001b3dcaf64/87871410359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3627/8425/files/esc_nstemi_guidelines_2020_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7971/0905/files/gabilebavezolifopet.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/86520530731.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/warhammer_40k_orks_8th_edition_codex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0600/6724/files/2380057968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5843/0106/files/microsoft_tfs_tutorial.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_off00006359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 5028 bytes
SHA-256: a2042cce0bc5ca6705d4d1870446e3aa88332a4ff5ef458b9b3c14c91782cb9d
font_01_sfnt_off0000749d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 11040 bytes
SHA-256: 906fbba2472af753bf3b77ce13b6d5a4f111b3925d16fdb94925e5b02bdba8bd

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