Malicious PDF — malware analysis report

Static analysis result for SHA-256 71249b5848d5e6a3…

MALICIOUS

PDF

45.2 KB Created: 2020-08-04 22:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92ff3d873beba6795781420853bd29e SHA-1: 28c27e0dfde568f7b14ae42b95e65638d00cf69b SHA-256: 71249b5848d5e6a31fade56526a8b28c82427b0c8e8dab61541e59ac28510f50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a game walkthrough and the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=legend+of+zelda+ocarina+of+time+walkthrough+pdf+download
    • http://rovoz.ontmoetpalestina.nl/uploads/1/3/1/3/131398428/9508919.pdf
    • http://files.connectionsgifu.com/uploads/1/3/0/9/130969873/22cb00a9.pdf
    • http://files.olgaandflo.co.uk/uploads/1/3/2/7/132712282/637aa5c71085.pdf
    • http://files.whitstablemusicsociety.org.uk/uploads/1/3/1/4/131409128/xesuma_radisomuruz.pdf
    • http://pikaj.armadalecoc.com/uploads/1/3/1/3/131398008/8742919.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/90217147300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf
    • https://cdn.shopify.com/s/files/1/0439/3703/8494/files/git_cherry_pick.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/larisapumebuxipovozuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/minecraft_xray_texture_pack_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2817/files/93468964885.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/kanuregogefazajuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/62614675033.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/3129941563.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/bujomewudedatagob.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/41211144634.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/46918415291.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_off000071e9.bin
9989113b947f2db0c9c3449f63f27aa308c5289ca7a90557599bfced4f1a2b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 5536 bytes
font_01_sfnt_off000084c0.bin
8c1e469587aac124ef3ef05012b9cfbb43d85ffc95cc5e1959aaceed1cce5527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 10068 bytes

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