Malicious PDF — malware analysis report

Static analysis result for SHA-256 077fd9828cc8f257…

MALICIOUS

PDF

46.9 KB Created: 2020-08-12 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43b2a3e33c2e1f5509190ae62c6fab2 SHA-1: 5ecff9b07fd3af1e099d4df1eae911e0c6f98bad SHA-256: 077fd9828cc8f2570dbf9c3cb43fa0858ca010072d3dc9798e452590bdbeb207
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 link farm designed to redirect users. One prominent link directs to `https://ttraff.ru/wb?keyword=wkhtmltopdf%20on%20debian`, a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though obfuscated, contains references to wkhtmltopdf and URLs, reinforcing the link-based attack vector.

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=wkhtmltopdf%20on%20debian
    • http://files.myranchoserrano.com/uploads/1/3/1/4/131437508/kuzulofofudo_fakon_fujididu_nipema.pdf
    • http://files.ps195magnet.org/uploads/1/3/0/7/130739182/vumogatobusaxorija.pdf
    • http://files.oshorisk.com/uploads/1/3/1/4/131454109/vaxiforafaziwelevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/belajar_adobe_premiere_pro_cc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/6640/7589/files/11430275253.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/kodinijetixilajipadalefu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/87160579615.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2327/files/analytical_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/refimutumuzotuvubal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/rabebobelusodajusap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/kavutedipazus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0583/files/cetoprofeno_gotas_medley_bula.pdf
    • https://cdn.shopify.com/s/files/1/0445/5186/4484/files/mgs3_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4986/1791/files/pokemon_ruby_walkthrough.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_off00005fab.bin
3baa451298b197543f183a76c4799964e25b94f3b9f6a86c3723af7c3227c375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 5224 bytes
font_01_sfnt_off0000715d.bin
c609eadb1f21fa048ee171236833622779eb74253495b1f239d8a280772c252a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 12024 bytes
font_02_sfnt_off00009930.bin
d654523ebb9e0ec0a7d1fa7a8b000352d666735de3b51e59a542fe233f3e7756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9930 16352 bytes

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