Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed3475031f0a9f…

MALICIOUS

PDF

64.5 KB Created: 2020-07-31 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12759e47cc00e941deb9bd1e90fea7ae SHA-1: 5139508438acc3266f089c02f829fa3d13c35311 SHA-256: 66ed3475031f0a9fde425fea48ba853c232b0dbbdbd2069eb46c35cd4fc11d9f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a malicious redirector. The heuristic firings indicate this is a link farm designed to redirect users to malicious infrastructure. The presence of a password-protected archive lure suggests a multi-stage attack where the PDF is used to deliver the password for a subsequent malicious payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=clasificacion+y+filogenia+de+los+animales+pdf
    • http://files.ancestryseekers.com/uploads/1/3/0/8/130874296/mibone.pdf
    • http://files.minnesotaflyfishing.com/uploads/1/3/2/3/132303035/vafusazikedagom.pdf
    • http://files.erinmerrill.studio/uploads/1/3/1/3/131383514/89887.pdf
    • http://files.monsieurbidule.com/uploads/1/3/1/3/131398360/7528800.pdf
    • http://files.navinpokala.org/uploads/1/3/1/4/131483830/lijapapowodegisubuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/42100285201.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/niratumivon.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9947/files/tunigololenanedajuxewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/wozofeforinurez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/gogaveziwawasigevomikid.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/3101648481.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/nasowalidevixadojasan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/68678484296.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37144816260.pdf
    • https://cdn.shopify.com/s/files/1/0428/4756/8039/files/dumese.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_off0000b9e0.bin
35cd8a2724742fab9f5629b0e39cde72c2fc73375a551b206be26253af156279		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 5212 bytes
font_01_sfnt_off0000cb8b.bin
bb2f94ac37124be3e7ff32489a8f1a950a767593df6e46a6466a924778a2935c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 12172 bytes

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