Malicious PDF — malware analysis report

Static analysis result for SHA-256 9547a8ffd0658d6a…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 19:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a820ec9d5938c6d5507a075261047872 SHA-1: 70edd6244be2e9063ea39a8c02fb962f0fd8d128 SHA-256: 9547a8ffd0658d6a8404bdcf1bf2fd6dd958f263a111c8c660efe7a454704ff7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=carlos+alberto+montaner+pdf'. This indicates a likely attempt to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains what appears to be junk data, further suggesting a malicious intent rather than legitimate content.

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=carlos+alberto+montaner+pdf
    • http://files.stmarkpreschoolcares.org/uploads/1/3/2/6/132682802/zotebazogud.pdf
    • http://files.gastrocycling.com/uploads/1/3/0/7/130775510/3527682.pdf
    • http://files.mobilelearningtoolkit.com/uploads/1/3/1/4/131438641/doruwerumadovo_figebiv.pdf
    • http://files.ncasemocha.com/uploads/1/3/0/7/130776272/pogaxibifetup-gegijoperabu-juvuguxomalo.pdf
    • http://mutaxewo.thebiblestudy.org/uploads/1/3/1/3/131383483/wizovofugadan-xuwabodiju.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/37565051428.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/mipowoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/lusij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/43662799769.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/24196448176.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9203/files/sewizopadige.pdf
    • https://cdn.shopify.com/s/files/1/0440/6060/6616/files/citizen_skyhawk_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/70883968635.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/mesudidenoturudomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/hiwin_ballscrew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/dazogabogawo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a9.bin
30a393c9749bd5ff78d689a6c1cb154027d1a2d7586fb0936a2c6b8ef0dd94f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A9 5092 bytes
font_01_sfnt_off000078d7.bin
83f16feeff4adb7c8e399c475b1dc892317fc5316dc0caed969d8e961ecd2190
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 10940 bytes
font_02_sfnt_off00009cf4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 4324 bytes