Malicious PDF — malware analysis report

Static analysis result for SHA-256 120edf6e86c18085…

MALICIOUS

PDF

34.4 KB Created: 2020-08-05 07:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae73642903e50a12f3a0c999d103ac3c SHA-1: b01c3878796d5b8a6c538c488c2e8105288aa152 SHA-256: 120edf6e86c180859b132d2eab59d047d8e46a3407b9f86b2b360e6c2bf0b7c2
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one prominently leading to a known malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body, though heavily obfuscated, contains the malicious URL, suggesting a phishing or scam lure.

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.com/pify?keyword=location+prepositions+exercises+pdf
    • http://files.nych2o.org/uploads/1/3/0/7/130739614/lemilizubot.pdf
    • http://nerilox.firebunnygames.com/uploads/1/3/0/7/130738970/lixekesabevazej-wepat-nelitexofuw.pdf
    • http://files.beautybykayrosh.com/uploads/1/3/0/9/130969470/6773535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/faduwezebadolemizemik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/nugeridakupezofobuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/4383483247.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5383/files/zakozojoromedifor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/41163727067.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6738/files/60799526439.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/wooden_toolbox_plans.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/11092083818.pdf
    • https://cdn.shopify.com/s/files/1/0438/8821/4171/files/oldsmobile_cutlass_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/giluzujuvex.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_off00004b1b.bin
b5812b93553c4d705cd6acd454bce41e9594a8d9e537b9291afe85448aa1752d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1B 5128 bytes
font_01_sfnt_off00005ca5.bin
d0f8ba0dbc25da9145349e1bf77a346a03e9f7595f7151c9c6b13ec79e1a80ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA5 9500 bytes

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