Malicious PDF — malware analysis report

Static analysis result for SHA-256 22722510256b7e73…

MALICIOUS

PDF

46.7 KB Created: 2020-08-14 07:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e75ca762557115e38d410c8e9ffe65c SHA-1: 9f3e559be903679f228773d2f6284976ce257c42 SHA-256: 22722510256b7e73f09ae39d0a409a71c596ad57cbe300b1339a61f9d1f9aac6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=cognitive+behavioral+therapy+ppt+pdf', suggesting a lure to a malicious site. The ML classifier also strongly indicated 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.ru/pify?keyword=cognitive+behavioral+therapy+ppt+pdf
    • http://files.integrityworks.info/uploads/1/3/1/0/131070459/5519815.pdf
    • http://files.rayzimmermanauthor.com/uploads/1/3/1/3/131382673/1303474.pdf
    • http://files.heathermclaurinart.com/uploads/1/3/1/3/131384098/9238a4d1c.pdf
    • http://files.dreampathwayskids.org/uploads/1/3/0/8/130873826/lixusuwikebipuv.pdf
    • http://files.birregurrafestival.com/uploads/1/3/1/4/131454126/diximiziniri.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/best_app_for_reading_books_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/8806597840.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/kubernetes_docker_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/fluval_203_canister_filter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/govop.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/pdf_file_merger_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/college_panda_essay.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/83374016031.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/5503822803.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/doxuwutisubevuwiza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/sonep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4750/files/fijamusu.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_off00006ac5.bin
b98eb61f962d9f656b93fcc2fe463e5deb24583a3bd25a95f4458b2e3a24a98a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC5 5236 bytes
font_01_sfnt_off00007c93.bin
620b318bd12c91dcf6ef0ba598f5ae11b7bc8f995570619c7697297b36fca46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C93 10284 bytes
font_02_sfnt_off00009f7e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7E 4324 bytes

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