Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d0aa10cc25e339…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 21:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df64a4cdce2c7b3ec8ba460e1f74d13f SHA-1: 2bcd596fcb944e31973b2363ffd8562dc1d408c0 SHA-256: b3d0aa10cc25e33913897a073e0a3d8123bd92165a45277d926c24c72a3f9f3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=customs+union+theory+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and references 'Customs union theory pdf', suggesting a lure to a malicious site.

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=customs+union+theory+pdf
    • http://files.johnlavell.com/uploads/1/3/1/1/131163976/773ee.pdf
    • http://files.deltagenetics.com/uploads/1/3/1/4/131407423/malilus.pdf
    • http://files.sstartravel.com/uploads/1/3/1/6/131637606/perewixefusos-jinugugugu-pojitinumosila-kigokob.pdf
    • http://files.francescobaroneweddings.com/uploads/1/3/1/4/131407148/2041803.pdf
    • http://files.francescalalanne.com/uploads/1/3/1/6/131637606/878910.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/48503085065.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/wodap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/xevafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/lupizerapumuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/fojesupubamugenijoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/18187858715.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/61191022204.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/balanis_antenna_theory_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7218/4732/files/jafopoliralumuzijika.pdf
    • https://cdn.shopify.com/s/files/1/0430/6078/9409/files/vatokabomapitutataja.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/chemistry_textbook_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/myers_briggs_16_personality_types.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604d.bin
4756dfc1b28ffdb58671abb664980e280cfaaed0570121b329b6c0ce88d2d75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 5044 bytes
font_01_sfnt_off00007150.bin
aca166af7c73d7adb9ad8ecb5654a436a87ce16bdbb9bb177cc422d12b1d581e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 9832 bytes
font_02_sfnt_off000092f8.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 4324 bytes

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