Malicious PDF — malware analysis report

Static analysis result for SHA-256 461089f5b08fbd2d…

MALICIOUS

PDF

53.3 KB Created: 2020-08-03 18:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71a453f00ee083d14a272ded78a9c7d SHA-1: 6aed8b4fbfdcda3546004a09f4195a8d86c79033 SHA-256: 461089f5b08fbd2dcf34dc3ff590d36da231ed085990c44c04895c51d9a744f8
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation scheme, containing numerous embedded links. One critical finding is a link to a known malicious redirector, ttraff.cc, which is likely used to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body contained mostly garbled text and URLs.

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.cc/pify?keyword=acta+constitutiva+de+una+sociedad+anonima+real+pdf
    • http://files.stephmader.com/uploads/1/3/0/8/130814717/duvoxotagusa.pdf
    • http://files.nestoncc.com/uploads/1/3/1/0/131071315/2ef2f.pdf
    • http://vilukam.benedictfriend.org/uploads/1/3/1/6/131606346/6465984.pdf
    • http://files.calabrianservices.com/uploads/1/3/1/8/131856949/7682830.pdf
    • http://files.propertiesbypaula.com/uploads/1/3/0/7/130775792/31408641155a8.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/logutoxisotimadula.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/54105425149.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/fawusapolimefujajokuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/widowesisutofeki.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/19667626678.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2397/files/jadug.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/69966596296.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/xifaleritadimulujipu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/advanced_analytics_with_spark_2nd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/63789665196.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/media_query_for_desktop_tablet_and_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/kazedidufuwewop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/jalosijagukiwotavisuvato.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/11236610979.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e9b.bin
d514cc983db4a7d51cd7579a8568ba1af0ebc3a436086e16290799d41992ae30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9B 5352 bytes
font_01_sfnt_off0000a0be.bin
e1c9058ee99e1d301e8e2a47278433a1907258b27afe23593dc4d02718ab3ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BE 11504 bytes

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