Malicious PDF — malware analysis report

Static analysis result for SHA-256 064f2f022a797774…

MALICIOUS

PDF

59.5 KB Created: 2020-08-06 19:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 289e9504cdfde401f850d443b715d678 SHA-1: 9577b1d4cc639aa0927fd7c71b073cd2613eb8ea SHA-256: 064f2f022a7977742b157392386d6d8c3099b74bd566bda9f22221a2d3cfd08d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Assam tet syllabus 2020 pdf download', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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=assam+tet+syllabus+2020+pdf+download
    • http://files.markseaton72.com/uploads/1/3/0/8/130874474/8527642.pdf
    • http://files.goldkingdomint.com/uploads/1/3/1/4/131437648/sogewiwi.pdf
    • http://files.gen2revcatholic.com/uploads/1/3/2/6/132681985/b6c4ccee8154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/11956580056.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/pedagogy_of_biological_science_tnteu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/24804878990.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/tibufefibiborakipeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/3390/3783/files/25335404027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/zozepavepus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/gilokebesikajekopuvuwobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/63134445676.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/koxiwoxikeliwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/43730603599.pdf
    • https://cdn.shopify.com/s/files/1/0430/3038/0698/files/wasujitosixutuxufixewida.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/elvis_presley_torrents.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008931.bin
7800f49b2bb49ac975d2d4fdd7d34f8099498a9a575bfb679f9075f731405e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8931 5688 bytes
font_01_sfnt_off00009c94.bin
8333a55037f4082a5d8464e6c20ffae5f1323b1ebf6bf7e7da9090e147eea2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C94 15104 bytes
font_02_sfnt_off0000cb57.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16092 bytes

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