Malicious PDF — malware analysis report

Static analysis result for SHA-256 250b303d09265d56…

MALICIOUS

PDF

50.1 KB Created: 2020-08-12 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c68df3bb983dc04197c34e521c3c21 SHA-1: 6981d85ca05ccc11623894df498221cd35f1a561 SHA-256: 250b303d09265d5621ab5c8a63ebc2cc71a066239b786edafbe5909e00497878
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector URL (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL and text suggesting a lure for downloading a PDF. The presence of numerous external links, many pointing to Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier strongly indicates 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=speak+english+fluently+pdf+free+download
    • http://files.oldvicarage.org/uploads/1/3/1/6/131606844/durugatupadogesixila.pdf
    • http://sarajaxu.applesbooks.com/uploads/1/3/2/8/132814930/gerinudizakedisefan.pdf
    • http://files.da1only1.com/uploads/1/3/1/8/131857494/kiwosuvunetigew_xenazakuwi_pepune.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/64078610523.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/abandono_escolar_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/jufuxudoxotunumedomu.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/convert_image_to_word_document_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/74034169612.pdf
    • https://cdn.shopify.com/s/files/1/0451/5794/1402/files/zaposinejisoladijotubajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/61040760894.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/jepigolajejawug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/57004603877.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/xobugosori.pdf
    • https://cdn.shopify.com/s/files/1/0437/7624/5922/files/27608993792.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/857_201_8118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.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_off0000732e.bin
44d21783df8c368b545a2b50e2dcbae394abddcc6441d5b5f50e0c588833cf40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 5664 bytes
font_01_sfnt_off00008685.bin
40b60280df043370fed5e238787deef6075387e1b2bc90dda9e289989ab2caf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8685 3824 bytes
font_02_sfnt_off0000953b.bin
2c1bf87a18cfa875095e26ad3783214b655ec18d5b3b82ed9cb86ff54ad836e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953B 10500 bytes

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