Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb99c8662ad210d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-04 21:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23124d21537c890ea98c7aee7a85c61 SHA-1: 38bd400550a7045b2cde8f9aa00df2797cbfa998 SHA-256: bcb99c8662ad210d4465fa00b3c5c3c77831248822eacafa0f710a36182e64a8
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book download, which is a common lure for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF. The document body and embedded links indicate a social engineering attempt to trick users into visiting a malicious URL.

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.cc/pify?keyword=kiran+psychological+aptitude+test+book+pdf+free+download
    • http://files.rogerckellygroup.com/uploads/1/3/0/9/130969686/gozurazonud.pdf
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdf
    • http://files.curriculumdevelopmentunit.com/uploads/1/3/2/6/132682663/loguzove-takidage-demisetiwuwob.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/40548943739.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5240/files/xaxetaxeki.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/xebefatokebedobabufive.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/60588720698.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/lugoxomijotopez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/8082996413.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/jikobowinebabix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/46884106966.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7348/files/mowideloxozufijobisamofun.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/66365682414.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/penyebab_parestesia_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/79931992559.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_off00005814.bin
70b0da892e3407dfcfaf31606c34b7aad307a386b0895d6e9ba49cfbe0b00d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 5784 bytes
font_01_sfnt_off00006bca.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCA 2116 bytes
font_02_sfnt_off00007594.bin
21eb61241f602bafff497be39afbc4b7df4bb758948f40d021dc58cb01a08b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 15400 bytes

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