Malicious PDF — malware analysis report

Static analysis result for SHA-256 730904860213527c…

MALICIOUS

PDF

60.2 KB Created: 2020-10-28 10:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31acabd239c25304caa5a3d3c2d3bb52 SHA-1: 157d06a05061671fdcd6cae48c014094d9f57edd SHA-256: 730904860213527c47bcf7a88e246bdfa1871722e7cf5fd274bac8f2bae2f73c
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?keyword=mr+math+blog+grade+6 In PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/6993056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f912e121a4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f9249c0067b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f925148ea1d0.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/35967f688.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/1218954.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/virif-kuwelu.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/gawixi-pinekere-bozuzel.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/vugoxelanasu.pdfIn PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/903f7a179be1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45600e2b-f95a-4606-b94f-889e0833743d/high_performance_habits_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2233562c-2c82-4a7a-806c-2a248775c615/xidivemolesunojet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6ff8ad-4b72-4403-8dbf-ef2bd9411f51/nupoxuniserevavopubatofer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3021/5317/files/viber_for_android_2.3.5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/aapka_naam_kya_hai_translated_into_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/life_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8897/9137/files/red_hot_buffalo_chicken_dip_costco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7590/6973/files/9940313909.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ba62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA62 23896 bytes
SHA-256: 7a520af77ab7611a42d4e7da4330df8f8af2fe528c10984d771830789bef2086
font_00_sfnt_off000084e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E5 5360 bytes
SHA-256: 8a9f41222736feb28d71d066273c43f1619c1f51df3dcfce6323356f7425c388
font_01_sfnt_off000096f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F8 10324 bytes
SHA-256: aeb7833728be9d330cf5de86698f2982006ddbba5af589ec1faad13f1cf95ede

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