Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1187aa1568dd2c3…

MALICIOUS

PDF

47.8 KB Created: 2020-08-22 01:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9ace26d227485eaf860b14bceedd83 SHA-1: 4d2c5f7986de6cf519017d4045e58f33b86d205b SHA-256: b1187aa1568dd2c3026685906e032f90a4033f82fba9add2756fc24c63d051ab
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'types of dogs' and a URL that appears to be part of an SEO poisoning or link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=types+of+dogs+94+percent+game+answers
    • http://files.customdivingservices.net/uploads/1/3/0/8/130873894/pofonisuteda-liwex.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/gunebazorofumaterawa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/pharmaceutical_buffers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/nonewarazerate.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/81992762291.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/pulemororo.pdf
    • https://cdn.shopify.com/s/files/1/0465/5330/1150/files/kemuzunipinekapesuteziju.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/citadel_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/48133838941.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6702/files/tupirowutemujedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/97874952.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/wulakaxipepejasuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3591/files/blockchain_dns_firefox_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/4166420223.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/
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/citadel_color_c

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006461.bin
b37cfc9e8739e63924026d294803412440ae6513c6028a4f86718305e4f40f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5828 bytes
font_01_sfnt_off00007848.bin
13bcde68e6cfb8eb012813a04a210b0020dfcd3e33a5bd2d8554d4dbeee9d470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 10360 bytes
font_02_sfnt_off00009be8.bin
4954ddec54c61b6acc7eddbac306bc890d05f3afdfcf3ae890c7612da0a7d668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE8 16376 bytes

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