Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b8f0eeecbcc080…

MALICIOUS

PDF

44.6 KB Created: 2020-08-23 18:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf464b0e61cadfe1999e1d52c8658c4a SHA-1: 0156ccc67bb24f053d1f5846818dc343b98bfe6c SHA-256: 12b8f0eeecbcc080ff0499d93a9464262b711b53b82a0f36a73f768975915c26
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=windows+10+offline`. This URL is presented within the document body, masquerading as a download for 'Windows 10 offline'. The PDF also exhibits characteristics of a link farm, with numerous external links, including one to `https://cdn.shopify.com/s/files/1/0434/7212/6117/files/voxavasuzi.pdf`. 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 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=windows+10+offline
    • http://files.grandpopsarmynavy.com/uploads/1/3/2/7/132740494/164f149.pdf
    • http://files.kikcrafts.com/uploads/1/3/1/6/131637273/5995869.pdf
    • http://welelibim.avongrovecommunity.org/uploads/1/3/2/6/132680874/216af08f354.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/voxavasuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/xosozujosizuwejewufojeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/minecraft_forge_libraries_failed_to_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/cpm_homework_answers_cc3_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/wexinodaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/99933280528.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/92137385297.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/59232569780.pdf
    • https://cdn.shopify.com/s/files/1/0441/1808/1688/files/novirisuredetoganej.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/adding_and_subtracting_directed_numbers_worksheet_tes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c4.bin
4de60237624147fb516b7ae17fff548550a11e4fbb34d87cb4f8815fa1ff1a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 4604 bytes
font_01_sfnt_off0000738a.bin
3c18b8d7c44477211673b446becec49bcc2e4473f3745f829d1696af2e18b762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738A 10616 bytes
font_02_sfnt_off000097cf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CF 4324 bytes

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