Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22dcdcf57c2c75b…

MALICIOUS

PDF

46.3 KB Created: 2020-08-24 20:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3dcf04fac8d11666dde49dae1026e7 SHA-1: 2fb51e30d42d1382307259e9b5a02fb158776a69 SHA-256: b22dcdcf57c2c75b3a1f290772902806c6cebd8c4593b619ccc555d71d0db35d
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains text related to software installation, reinforcing the lure. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this assessment. The primary attack pattern involves tricking users into clicking a link that leads to a malicious download.

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=wondershare+pdfelement+pro+offline+installer
    • http://bavunina.onlinekitchensdirect.com/uploads/1/3/2/6/132683165/xulapesuwozegib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/69420646827.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/bilit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/81051046314.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/48608693925.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/57618455678.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/75580206877.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/gemeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/bebimuxuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/diablo_2_rune_words.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/tosovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/frontpage_recentchanges_findpage_help_contents.pdf
    • https://cdn.shopify.com/s/files/1/0439/0774/3899/files/72512832200.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/27064409585.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_off0000760a.bin
4a71f211143f8bcaca67e5d10712517f6751783144de3d3ead2083c8521dc353
pdf-font-stream PDF embedded font (sfnt) at offset 0x760A 5292 bytes
font_01_sfnt_off000087ec.bin
19666add4b1113e9a961c637ea32507a6d35720c7b0cbd75d88f9320f92bd290
pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 10724 bytes