Malicious PDF — malware analysis report

Static analysis result for SHA-256 054788c16b82b6b5…

MALICIOUS

PDF

53.1 KB Created: 2020-08-24 15:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94be1d83fd11a0fd34be388130af13c SHA-1: a3d097ad10be320ffcc7b2954b60ad751c1a42e6 SHA-256: 054788c16b82b6b5db75af135821f71e75621b449931581f0f3db9affc0d91c0
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a game download. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to distribute malicious content. No scripts were extracted, but the presence of malicious links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=assassin%2527+s+creed+2+java+game+240x320
    • http://zukamog.pawsupforbows.com/uploads/1/3/1/3/131383544/fibalazo_kutiguxejuzar.pdf
    • http://xinek.crosswaylacrosse.org/uploads/1/3/2/6/132695300/nisixerafiluzuroga.pdf
    • http://files.framin-gallery.com/uploads/1/3/1/4/131453022/puwoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0433/9204/1118/files/3_bedroom_flat_plan_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0436/0765/4563/files/ielts_reading_question_types_and_tips_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/aflatoksin_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/bogixagomuzotuwebutubag.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/94282332437.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/lubavavokabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/tipos_de_caries_dental_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/apis_mellifera_adansonii.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/tokuzevifujabix.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_off0000726e.bin
2adbdcb8653031eb20c662f2c59f477d57798e2af14eb29c8b6a981735337e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726E 5980 bytes
font_01_sfnt_off000086c6.bin
b92c07bb7553df30903d564319d4b25da47cc3dd922d2426bb601379271a6cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 14532 bytes
font_02_sfnt_off0000b1f8.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 16092 bytes

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