Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4a6a1e621f22a4…

MALICIOUS

PDF

69.5 KB Created: 2020-08-23 04:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9757b7f80837491d90ddc9a84fe21ae7 SHA-1: 63a857415df85a59869f443cdb631b8b1ee0b0c3 SHA-256: 8c4a6a1e621f22a42860379e3831e558fb1d0966dd3e8c78cb37310292377f55
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=photoshop+brush+sketch', points to known malicious redirector infrastructure. The presence of this link farm suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. 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.ru/pify?keyword=photoshop+brush+sketch
    • http://fawuno.lamsdorf.com/uploads/1/3/2/7/132710621/8d0c283f1c5a143.pdf
    • http://files.flowcounselling.com.au/uploads/1/3/2/6/132681672/5260785.pdf
    • http://files.josephkraft.com/uploads/1/3/1/4/131413040/zotixetomum.pdf
    • http://files.newellchristianschool.com/uploads/1/3/2/8/132815388/b584154e1d9.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/kenuzokuzugudexegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/biblical_meaning_of_numbers_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/gunks_guide_services.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/gajagakuwerebepef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/bisanepatis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/jawuvunowirokurelel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/secondary_amyloidosis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/75500449490.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0432/1738/7682/files/a_haunted_house_full_movie_2013.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/77644219478.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_off0000d36f.bin
28fadb0d5fc2da7d46ac8019aeb0a9e5acf73bea1e4a111a92073f664141d84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 4984 bytes
font_01_sfnt_off0000e45e.bin
03516ce2966d3fac87cd515bd46b8d2183c94124e2bb30c12f2200a462899663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 10636 bytes

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