Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63f54d2e4b78ffd…

MALICIOUS

PDF

48.0 KB Created: 2020-07-29 21:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 293972640d61ba509a25b17c9c78ae18 SHA-1: 6721660a8398ce9fdae049ea3ad23c4f6fa4968c SHA-256: c63f54d2e4b78ffd1c03750d504248412f68ae0c84bc3815da2664f92e8562ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a malicious redirector link disguised as a free download for 'animation books for beginners pdf free download'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK firing confirms the link points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=animation+books+for+beginners+pdf+free+download
    • http://files.kenthollowayonline.com/uploads/1/3/1/6/131606349/8475532.pdf
    • http://files.holo-visions.com/uploads/1/3/1/8/131856318/kujipuvoto.pdf
    • http://files.evangelicalexpat.com/uploads/1/3/1/4/131453206/teruluzof.pdf
    • http://files.stephanschutze.com/uploads/1/3/1/0/131070526/movidagipenes_bodiruruno.pdf
    • http://files.martialhartamas.com/uploads/1/3/0/8/130814279/6186ec0be38b.pdf
    • http://files.evangelicalexpat.com/uploads/1/3/1/4/131453206/t
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/13458359191.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0406/files/lujofidezowoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/wogupog.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/37107129376.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2063/files/12496431238.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/13541790920.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/47099084905.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/31363826721.pdf
    • https://cdn.shopify.com/s/files/1/0438/3644/0726/files/seler.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/11931270230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/10045455176.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/mavilavisavabaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/11420909087.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b96.bin
fb5070bcf359d5897e55f54a654a6349ea98ccfcb32fcce819763d1016cfa82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B96 5436 bytes
font_01_sfnt_off00008dff.bin
ac2660f3a0db29bfab8aa2f38da3a3efb9caa6f512b08caf732c488375bf53be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFF 10676 bytes

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