Malicious PDF — malware analysis report

Static analysis result for SHA-256 170a73f9df8db9c5…

MALICIOUS

PDF

64.0 KB Created: 2020-08-13 01:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b914c01000d6fd2083be685c95a84ec SHA-1: 0bc0d7360e49e026a23e2d36585f330b855fc22d SHA-256: 170a73f9df8db9c5a279da53878cd4f4b5d477beab4c46c614fd06f3d2291a06
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=buku+akuntansi+manajemen+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious content as a legitimate PDF. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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.com/pify?keyword=buku+akuntansi+manajemen+pdf
    • http://files.trixielizard.com/uploads/1/3/2/6/132683070/dezowebemajij.pdf
    • http://xizunupi.castlehillfrenchies.com/uploads/1/3/1/4/131406717/518078.pdf
    • http://wirerofu.uofurugby.org/uploads/1/3/1/4/131437823/jozezof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9422/6584/files/92372125659.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4349/files/saving_throws_dnd.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/history_of_apparel_industry_in_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0440/3150/8645/files/tegikaximonigizusu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/febixudidilinozunarafupan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6923/3565/files/applied_mathematics_1_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/jebej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/22282046921.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/delokabudemotew.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9616/files/bejukedugugifigavewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/kibowiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/56137409439.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_off0000bf76.bin
002b4325ab6b85eb3e213191f4d6c2b4b4566d57fff5177da19b011a0214f688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 5248 bytes
font_01_sfnt_off0000d149.bin
60e7820f2826b299eab2fd14e2ffe814787d81a4ad2bb26d778d40daba213d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 9968 bytes

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