Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3c940620e2d569…

MALICIOUS

PDF

43.1 KB Created: 2020-08-13 22:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10857ba7bdf5cdf682ef5306b7b4ba8 SHA-1: dd236d903fc543ab3df8629de1293286685f9ada SHA-256: 5e3c940620e2d56984f53699eb7b7f63884598d9a6f1f035a1c309b58609fbd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=movie+streaming+apps+for+android+free, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to movie streaming apps and the URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=movie+streaming+apps+for+android+free
    • http://files.foreverandalwaysmamas.com/uploads/1/3/1/4/131452944/51302.pdf
    • http://files.biocompositesgroup.com/uploads/1/3/0/8/130873872/gajutixagos.pdf
    • http://gagawap.wilsonramband.com/uploads/1/3/1/4/131482975/nivivafidadabufanu.pdf
    • http://dasov.wolfridgearchery.org/uploads/1/3/1/4/131483281/netezinaduwepaduto.pdf
    • http://files.beyondthestorycoaching.com/uploads/1/3/0/7/130740364/1095451.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/nezazegevemaka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3649/1431/files/im_autoconverter_for_accel_platform.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/piligavepuzo.pdf
    • https://cdn.shopify.com/s/files/1/0448/1817/0018/files/67232612136.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/rococo_architecture_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/20624212985.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/easy_cocktail_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2503/files/inverse_trigonometry_formulas_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/koson.pdf
    • https://cdn.shopify.com/s/files/1/0434/6727/6454/files/fagesakobego.pdf
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/el_aprendiz_del_brujo_pnl.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b99.bin
17c416446acd9b591d1981689c891507aa34c506cfceb83aee5893d85dc20d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B99 5392 bytes
font_01_sfnt_off00007de9.bin
ba37b2b59b148cee2e31528c153660bef189d4681b9b0feefd81bd7cd53fe813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE9 9828 bytes

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