Malicious PDF — malware analysis report

Static analysis result for SHA-256 707f69f76723ba45…

MALICIOUS

PDF

44.5 KB Created: 2020-10-22 16:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 468fdf6001ac527fa8db1c3f8bdc8303 SHA-1: 9d0ab51671dd1f5d01cd1666a52c96cb35ffb0a0 SHA-256: 707f69f76723ba458bac756460cdd1e19b06f1e2adab400845e78031248ce8b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that point to a known malicious redirector and a large number of other PDF files, suggesting a link farm or redirection scheme. The document body advertises "Gta 5 android free download", indicating a lure to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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=gta+5+android+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8af9ae8ce77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f8bc45033613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8dc150655cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f8ec23f7a781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f8aba7f98b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5f8e9f72c4a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f8afb3566994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5f8b5f2f0185b.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://cdn.shopify.com/s/files/1/0492/6108/4828/files/84939792134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2743/0059/files/xilav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9970/9333/files/ccna_routing_and_switching_exam_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8488/8260/files/21954353907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9691/5616/files/damiserag.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/sanonutugamekifofaluw.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/zamapuzefijurex.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/xobuwepivizevepaku.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/78626465512.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/all_in_one_english_class_10_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/91581364040.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/zuzizudukazeke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 4756 bytes
SHA-256: 0584a8c4663db93c6ac9f1bd262f306115eab4b4a2bd216405cc0f98bcc848d3
font_01_sfnt_off0000744a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 10084 bytes
SHA-256: 190d5db77c12c1188d737769fdced439822c4d95259891a8e7b3deea0c7ff15f
font_02_sfnt_off00009692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9692 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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