Malicious PDF — malware analysis report

Static analysis result for SHA-256 0409a14e489dfffe…

MALICIOUS

PDF

50.5 KB Created: 2020-08-18 20:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5c65e26c5168191e82ffd85f63073a SHA-1: d53755248f4b771629d41766c23eaabaef600f9a SHA-256: 0409a14e489dfffec8c108c1f86447cc85874033edee24b9e96590a4a8de3ae9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host and distribute links to external content, likely malicious.

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=picsay+pro+paid+apk+free
    • http://files.servicesgoglobal.com/uploads/1/3/1/3/131380467/4725000.pdf
    • http://files.silverspoondinner.com/uploads/1/3/2/6/132696174/0efe5e831742cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/12487409204.pdf
    • https://cdn.shopify.com/s/files/1/0447/6986/9975/files/automated_trading_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/depoxokenumedoragoxinixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/baby_names_girl_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/anestesia_local_e_geral.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/14070706405.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/jump_math_grade_6_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/sally_s_beauty_supply_application.pdf
    • https://cdn.shopify.com/s/files/1/0440/7666/2934/files/jigukitakevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/ccna_200_120_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/xizasulatazofukasisuzubej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/type_ireportservercredentials_is_not_defined.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/47198029422.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/vafofatofeziviruwon.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000707a.bin
441886fb349ebbceb382f773fcac7e5227c0b2a8383f83b0aa00ed27f441d399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 5284 bytes
font_01_sfnt_off00008286.bin
c53d76b3c8e3d4c6257021ef1c2015932f6be33420aaafb2c02ed0b247acaf85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8286 10784 bytes
font_02_sfnt_off0000a776.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA776 16092 bytes

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