Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c89959de89d996…

MALICIOUS

PDF

38.6 KB Created: 2020-08-18 12:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b9b492632d9cb4dce15a2b2f6831f1 SHA-1: 395a061aeb8141fa0b9ceec6c7d64b9747ef772c SHA-256: 25c89959de89d99648a56db40ae29723a02a794bce323a94797db1b6fa03b99b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'dilations worksheet'. The primary attack vector is likely social engineering via a deceptive link within the PDF.

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.com/pify?keyword=dilations+worksheet+draw+a+dilation
    • http://files.doodlenotes.org/uploads/1/3/1/3/131379594/e7148e744.pdf
    • http://files.swwsupplies.com/uploads/1/3/2/6/132681749/839728.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/dusemokixav.pdf
    • https://cdn.shopify.com/s/files/1/0444/4022/3911/files/bank_job_application_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/ejercicio_aerbico_y_anaerobio.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/485190721.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/pubunuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/pugawaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/meruwuvonixejixibegam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/english_hd_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5505/4999/files/melaruvodukepivanugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/rokutananula.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/17996955470.pdf
    • https://cdn.shopify.com/s/files/1/0429/8116/3157/files/vejeposusifabenekojiful.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_off00005b23.bin
fc12169142dee75240e23bec744d06bc91d2aecc035631c74fd7ecbeea588484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B23 5068 bytes
font_01_sfnt_off00006c63.bin
6a6088e3535772d9e510cd172489cedf416e96ea1155dfb3845f70cb9c2e4db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C63 9712 bytes

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