Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5110b613df8e01…

MALICIOUS

PDF

66.0 KB Created: 2020-10-31 08:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c495d742f305fb2de211fbf9ce1d0d SHA-1: 993ffe2afc6ffc3cb9ab64b6de9d2ec8e97b1ac8 SHA-256: 1a5110b613df8e01a9ab18bd4597d60c472103c1609038bec0fbcb2b6cfd7c64
162 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector. The document body text, though partially obfuscated, suggests a lure related to financial reconciliation. The presence of multiple PDF links, many pointing to external sites, indicates a link farm or redirection strategy to distribute malicious content or facilitate phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=the+reconciliation+of+the+cash+register+tape+with+the+cash+in+the+register+is+an+example+of
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f8f753cac3af.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/sakuramexiperofi.pdf
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/fovupoxuzuxovijupomu.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8a89b271acf.pdf
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8c065112bb0.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5f9a907920e1e.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f8b6d2bee305.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f8c83a877c90.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f8d8eed43b52.pdf
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8bebe89a813.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f89a1c9b6a38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0495/5983/0680/files/funny_lock_screen_wallpapers_android.pdf
    • https://cdn.shopify.com/s/files/1/0503/6923/3094/files/manaludu.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000cca0.bin
2af72a2b18c7782cc17e0aca3c98d32d70387692ca94d9c69d4e6e6a451cf9ff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCCA0 26824 bytes
font_00_sfnt_off00009551.bin
866d842b25cdf8291ba333902c6c123e063ca39e7491b7af007877b9eadf5f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9551 5540 bytes
font_01_sfnt_off0000a818.bin
b67514143c5e4152f60c2a30d8d06fa35478135ea94ea91d2404c775ebd2baca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA818 10604 bytes

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