Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd25f83ded4cc32…

MALICIOUS

PDF

43.0 KB Created: 2020-08-05 01:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46f907bfc9077695f470062c3c6803c SHA-1: 673802a74d442b270c31722a5fb700401eec6ef3 SHA-256: acd25f83ded4cc324df6835f92d3719dad07738b07101e8c6d3d42cca0793040
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a seemingly benign keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, likely to obscure the malicious destination. The ML classifier also strongly flagged this PDF. The document body contains garbled text but includes the malicious URL and several other URLs, some of which are hosted on potentially suspicious domains.

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=problem+solving+therapy+worksheets+pdf
    • http://files.fleacircusoz.com/uploads/1/3/0/8/130874598/8147516.pdf
    • http://sogawav.notestotheunderground.com/uploads/1/3/1/4/131437812/rulid-jivosibogulanez.pdf
    • http://files.tarasullivanphotography.com/uploads/1/3/2/6/132682655/sopimujomeko.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/tabasolofumuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/nofofuxizelurewogopija.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/79274124661.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/function_of_rough_endoplasmic_reticulum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/3m_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/58587470787.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/kuvakamowux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/risijugurosudituravol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/38664727521.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/after_you_ve_gone_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/wirikefevaduxajugojabat.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/58632088782.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/67202665327.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_off000068f0.bin
e9fc2077a9ef28efb4595dc0174e60fe8be209c26b9bc754636db1519b93f520
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 5912 bytes
font_01_sfnt_off00007cff.bin
b20716de8af07804821ef8f1ff5708c805cdf70134654b81f8a1a7e18edbe455
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFF 10024 bytes