Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ad3666444c90af…

MALICIOUS

PDF

141.6 KB Created: 2020-07-31 22:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9e5ef09117de57ff23eee355a89b857 SHA-1: 4ad7d4ba777d8ebcf5d908530c90bc1b813fd7b2 SHA-256: 51ad3666444c90af9fe8174bdfb8ba368945d750dddacf650595866d17fa519f
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=pso+blue+burst+mag+guide'. Additionally, it exhibits a PDF link farm heuristic, with many links pointing to shopify.com, one of which is 'https://cdn.shopify.com/s/files/1/0432/8846/1478/files/28612675947.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=pso+blue+burst+mag+guide
    • http://files.timperleygardencentre.com/uploads/1/3/0/7/130739308/6309311.pdf
    • http://files.paulinegough.com/uploads/1/3/1/8/131871909/038105.pdf
    • http://files.michaelayates.com/uploads/1/3/0/8/130874539/984bfe8e345.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/28612675947.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/25858405844.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/70550890013.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/teruvofilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/42968380959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/fopafejajajaluvomoxuraxow.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/xovoduredusipikobebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0274/files/98323168071.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/18512662187.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a67e.bin
2c0a3f44360478ce66a5e9c2ec46ab03f4775631d2bf4da68001331f6f56608c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67E 3316 bytes
font_01_sfnt_off0001b253.bin
40b46df6a3cc450ecae18c6e7cf36dc6045a197b7af58a7fce4d03499a8793da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B253 5064 bytes
font_02_sfnt_off0001c37f.bin
4de4c49e1e3b38aa89657956a6f09e7fc272af3dcedc884a3cd1ce9eec73c7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C37F 3152 bytes
font_03_sfnt_off0001d03f.bin
5535bf67e73150f938e6881836c5f0366d848cae4cdcbd18e106e771264dfbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D03F 16308 bytes
font_04_sfnt_off000202d1.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x202D1 16092 bytes
font_05_sfnt_off00021799.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21799 4324 bytes

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