Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efd5412691482a4…

MALICIOUS

PDF

45.2 KB Created: 2020-08-19 05:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301b916123130a3eeeca2f4fb4dc4055 SHA-1: a0f84f129986e9eaf584e6e2a44bb3739a19514c SHA-256: 0efd5412691482a4a4083ca1da7692ff5d83dd492273718cfeb8dce5640577e5
162 Risk Score

Malware Insights

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

The PDF contains a lure related to exam dates and embeds numerous links, one of which points to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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://ttraff.cc/pify?keyword=cbse+12+exam+date+sheet+2020
    • http://juwidil.stutteringtherapyaz.com/uploads/1/3/0/7/130776647/5ca6ea5abfd4.pdf
    • http://sarapaba.suetastic.com/uploads/1/3/2/3/132302936/zoruwigizado.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://files.replenishnaturalhealth.com/uploads/1/3/1/3/131382239/bunededivigi_momala_xamakamawizi.pdf
    • http://files.jessakid.com/uploads/1/3/1/4/131483955/dimosadizib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/helvetica_neue_import_css.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/11585025692.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/valvular_heart_disease_esc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0454/5445/9030/files/fishing_leveling_guide_ff14.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/andrea_hirata_laskar_pelangi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/17208712991.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/belfast_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/47287752677.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/book_of_the_damned_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/c_alias_template_function.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006583.bin
2b5e201c8d7f1e4175ba721f49c432b7b932112f350f8458dc5269def3b20b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5016 bytes
font_01_sfnt_off00007696.bin
1a348b9412f80a25307c46e9ab951c7fefbe850e286730649fbc40ae24cc79b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 10288 bytes
font_02_sfnt_off000099f0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F0 4324 bytes

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