Malicious PDF — malware analysis report

Static analysis result for SHA-256 05237d7fcb9b6e7c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-24 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b54fe0ac81879fd88f8cf4050806e7e4 SHA-1: 76f806c334d1d4df3460f62ad5b87e4fc29aab83 SHA-256: 05237d7fcb9b6e7c3480b565ec244e4f57e663c91aafd3fcae23694fab7ccd4f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure and the redirection to a link farm suggest a phishing or malware distribution attempt.

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=hssc+advt+11%252F+2019+notification+pdf
    • http://files.tenderlovingcats.org/uploads/1/3/1/4/131455832/c6048d246e0c.pdf
    • http://files.anisaradio.org/uploads/1/3/0/7/130776656/kesivikofalipimi.pdf
    • http://files.cptoffice.com/uploads/1/3/0/7/130739287/6460365.pdf
    • http://files.mainternational.net/uploads/1/3/0/9/130969206/4bc09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/wuxepolonuwuverase.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/nabedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/25785414752.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/programa_arquitectonico_de_una_casa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7617/3472/files/zepawow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/guxigobokuvowositosujiluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/93442306952.pdf
    • https://cdn.shopify.com/s/files/1/0464/8747/0248/files/xakukotejuwodufujagofidun.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9203/files/tanukafugagabi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/80_alkaline_20_acid_food_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/tiliwuwomarasivijar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/hssc_annexure_e1.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/82107709998.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_off00007028.bin
22ebb2166f92ac6481d6c2c04dc85526ab917ebf2ea049b85bef243545325d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7028 5560 bytes
font_01_sfnt_off00008331.bin
57c9a358e0ea7f9a1a2c47b3f51efd697d8626cd9ca7bae8845dd237e5b4826d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 11928 bytes

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