Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f1b6b82d0719df…

MALICIOUS

PDF

51.4 KB Created: 2020-08-14 02:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76b307683a29dd026c3f32419626d23 SHA-1: 2c0241f5c19f242ef3b7f4ac5be5ad9dd69026be SHA-256: 52f1b6b82d0719dffd8d37e38caace0b104c680d1b06b397ff4bbdd940e4e7fe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many of which are likely intended to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic.

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/wb?keyword=midpoint%20worksheet%20geometry
    • http://files.hazlehurstcentre.org/uploads/1/3/1/4/131437249/3037862.pdf
    • http://files.scotdancenz.co.nz/uploads/1/3/0/7/130738769/8399703.pdf
    • http://zijuk.tourscottys.com/uploads/1/3/1/4/131453630/6276233.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0985/files/sobotta_atlas_d_anatomie_humaine.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/dedudorolojire.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/baxomezeditaporopobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/todusisavelex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/8296577732.pdf
    • https://cdn.shopify.com/s/files/1/0435/2199/9008/files/hdfc_bank_ltd_rtgs_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/femepisuduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5435/7915/files/portfolio_lighting_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/vebasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/prc_answer_sheet_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/8011/3562/files/practical_guide_to_extrusion_blow_molding.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/bijororoneb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/66165293020.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081a4.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 2828 bytes
font_01_sfnt_off00008b9e.bin
f04e27259213ecab16dc27e79f8dec52ca068529ccf4f5518d87f29041941bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 5396 bytes
font_02_sfnt_off00009de9.bin
692330118ebf97bc94bc9e17e8509ab3164b620d454de1882c1d55c604f63083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE9 10060 bytes

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