Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e3562c386ae323…

MALICIOUS

PDF

43.9 KB Created: 2020-08-22 03:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d798d97f994a7a1ffc9a7969103e98c SHA-1: d1fce208031daacd8a1510aed2bbbaae354ee122 SHA-256: f2e3562c386ae323e729c66d336f89a63436d79b5d73f6dd6f18d2e9679f0ae5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to other PDF files, a technique often used for SEO manipulation or to host malicious content. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

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.ru/pify?keyword=beechcraft+duchess+76+poh+pdf
    • http://files.artiefest.org/uploads/1/3/1/4/131438157/banutivo-jivibomakosixos-jebifefebopewuz-xofolo.pdf
    • http://dadotuno.ronamaybryan.com/uploads/1/3/1/4/131407226/e29724d03d.pdf
    • http://files.eringilbreth.net/uploads/1/3/1/8/131857445/ziwat.pdf
    • http://files.rmgilmore.com/uploads/1/3/0/7/130740138/bee8ca4.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0498/files/9836606407.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/sokudozaxadupoluni.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/fesijosegakifawivin.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/fanilotajud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/mailing_address_941.pdf
    • https://cdn.shopify.com/s/files/1/0432/8718/3515/files/autocad_2008_32_bit_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/bankable_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/9391935166.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/5112347366.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/52581767832.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/16075900643.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/31636488235.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e34.bin
681018e9ad86036f78540c9f6137396a82f83d4c99e3ef7d0037801baa80962b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 5220 bytes
font_01_sfnt_off0000700c.bin
f5f12c653315158e78cc2013e74d3ee588b260d4f73cb608a64317bfd29316d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700C 10628 bytes
font_02_sfnt_off00009477.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9477 4324 bytes

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