Malicious PDF — malware analysis report

Static analysis result for SHA-256 5266c06d1e365dfd…

MALICIOUS

PDF

33.6 KB Created: 2020-08-12 13:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbf670bac33cd21902ebc199f624c38 SHA-1: 891aa6b4b4c4f3fd1faac018c3fddb9137f21a53 SHA-256: 5266c06d1e365dfddfaaad379b59c799870f8cd9fcd409a19796bd428eaa21bf
152 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 redirector link to 'https://ttraff.cc/pify?keyword=lullaby+of+birdland+solo+pdf'. This suggests the document is designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a link farm and a redirector points to a delivery mechanism for further malware or phishing 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.cc/pify?keyword=lullaby+of+birdland+solo+pdf
    • http://bojafe.finnishinncider.com/uploads/1/3/0/7/130776031/157201.pdf
    • http://zuwukov.originalgoodfellas.com/uploads/1/3/0/8/130874493/zinaku.pdf
    • http://files.4linknats.com/uploads/1/3/1/8/131856769/6348322.pdf
    • http://rakikobo.robertmcaffee.com/uploads/1/3/0/8/130814729/59dd344ecae.pdf
    • http://files.mycousa.com/uploads/1/3/1/8/131856205/11251.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/9053311588.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/ludujitok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0598/files/zuxuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/20766354079.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/australian_visa_application_form_600.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/nijupusikuvuwowoxutum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/4082356636.pdf
    • https://cdn.shopify.com/s/files/1/0436/7246/9669/files/62887167750.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/zetokigakefuzebadaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4999/2870/files/stardew_frozen_tear.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/61018143021.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/6680192711.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/84987197443.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_off00004655.bin
f8233f4a8f46867aede631314c9c102bcabee1ad3362569dd743a26e32297660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4655 5216 bytes
font_01_sfnt_off00005820.bin
c2746b0bd6b62d001e70c4fd2b35f2303a21bde3695b5903b352c27b7c9fc0dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5820 9756 bytes

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