Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06a07e6058a71fd…

MALICIOUS

PDF

36.8 KB Created: 2020-11-02 05:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a6616687e433c2e1aac9de66ad98a04 SHA-1: e37568beffb32f83a221ac18a549f73d7dcc2857 SHA-256: a06a07e6058a71fdb9436f4a6c3105a4884e02c24a92fe780db9e481a8ee2ee4
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 critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=disable+kaspersky+keyboard+security'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to benign Shopify and S3 domains, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://ttraff.ru/pify?keyword=disable+kaspersky+keyboard+security In 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/1/0500/6416/2980/files/53448514436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6852/0085/files/cartridge_headstamp_identification_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0507/8434/files/jntuh_r15_4-1_syllabus_cse.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/flute_scales_and_arpeggios.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/majajutasumaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fc20f6-4583-4cc3-8291-da21b23c70d8/charlie_bowater_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0800/2728/files/strikes_and_spares_pinball_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/ought_to_grammar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0678/5430/files/53375799172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bf75a1-0a32-4c77-a707-403b1618e815/gozejodawef.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/neutrons_in_selenium.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7685/3153/files/nccn_colon_cancer_guidelines_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4617/7448/files/robinovugilajunis.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_off000049f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49F3 5372 bytes
SHA-256: b61d85e95a93d3e14bd1f92da98df1a3d5eb33b0fc04e9f052684ce896e73154
font_01_sfnt_off00005c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 13048 bytes
SHA-256: 4d85bfa69a7cf22e89979c39f8fb799925493d029a2a7514350fec1bfeb5a087

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