Malicious PDF — malware analysis report

Static analysis result for SHA-256 9026458ffac8c035…

MALICIOUS

PDF

48.7 KB Created: 2020-08-09 06:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e47974d145fcdcf6fbb7995f76d8706 SHA-1: 53b506c1a3357afef7adb1bff27d01bca0dcca42 SHA-256: 9026458ffac8c035b85777d6ba6100941477cc05feb802f3a5af1f9c552d5173
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=fatty+acids+names+pdf', which is likely used to obscure the true malicious destination. The presence of numerous other PDF links suggests a link farm or a broad 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.ru/pify?keyword=fatty+acids+names+pdf
    • http://files.fromsandy.com/uploads/1/3/1/4/131484133/xajukagaw-dofixunevuvemab.pdf
    • http://files.shape--sanctuary-healing-art-prayer-encounter.com/uploads/1/3/1/6/131606435/worag.pdf
    • http://vomikuvi.htemch.org/uploads/1/3/0/8/130874493/1df33f2ec9a.pdf
    • http://files.djayu.net/uploads/1/3/1/8/131871938/00cb800b61.pdf
    • http://files.caribbeantrips.ca/uploads/1/3/2/6/132681452/1dd8653608222b.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/15717730819.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/55458897535.pdf
    • https://cdn.shopify.com/s/files/1/0437/0615/5173/files/35823843610.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/camera_scanner_vers_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/51276663757.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/nusozikixefetunexazifuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/neoclasicismo_literatura_espaola.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/sudolaxiwimopeteramofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/watch_american_pie_online_megavideo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/xovilewotegage.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/65501652071.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/java_8_update_45.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/xipibufo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c6f.bin
c29eb313f5fb0d312efb213c3052fd8b53676f010d38fa0532c0eabc84d1d737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6F 5232 bytes
font_01_sfnt_off00008e3e.bin
98defb44c2ba4c46aa84184427d928cd041372241daef8cafc63cea7542f2d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3E 12172 bytes

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