Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51a875ca42c07ac…

MALICIOUS

PDF

36.3 KB Created: 2020-08-23 18:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0bb1e45cab307f5e892e62483c9cd03 SHA-1: 7b1f7611e16b1b6d9d66c14dad293e4fb41e52b7 SHA-256: a51a875ca42c07ac64e96531ac0f7df3d9a8167a155c57b72080d89426d98568
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains the target URL, suggesting a lure for users to click through to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=coin+toss+ringtone
    • http://files.webberweather.com/uploads/1/3/1/3/131379820/4842439.pdf
    • http://zesiro.adgermanwarehouse.com/uploads/1/3/2/3/132303382/426729.pdf
    • http://fozovitak.oriontrainingsystems.com/uploads/1/3/1/3/131383363/difepora.pdf
    • http://files.beautifulshares.com/uploads/1/3/0/7/130738700/541ec0950fdf32.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/gajodugetakinobarezet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/augmented_reality_android_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/analog_trip_in_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0460/2927/5295/files/anaconda_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/81346474426.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/chatham_county_probate_court_forms.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/58033854507.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_off00004b30.bin
c14d10bcd22d64e03f0fe8c41d8c701bb25e513767093bf905f4b721ff20530d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B30 4516 bytes
font_01_sfnt_off00005a9a.bin
abde5aff8a9e280b8c28908f1a2a125ee5ca34e134634fda6b9855a71c97206f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9A 13484 bytes

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