Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6c3756683424c…

MALICIOUS

PDF

43.9 KB Created: 2020-08-09 01:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b028b94837bb863c4df3ece76dc917c2 SHA-1: 57cc9ff011559098f64d75d00a923945ee85ee8d SHA-256: cbf6c3756683424c798491aaea96ee70f4508a33b8133d011d979086677b61ff
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests the PDF's purpose is to lure users into clicking the malicious link, which then redirects them to potentially harmful content. 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.cc/pify?keyword=behavioral+game+theory+colin+camerer+pdf
    • http://files.alexandergalant.com/uploads/1/3/1/3/131398477/2278538.pdf
    • http://files.drcoachkellipt.com/uploads/1/3/1/6/131606118/89fb1945b1e.pdf
    • http://files.hdndatabase.com/uploads/1/3/1/0/131070846/9726254.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/hansel_and_gretel_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/jubameta.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/47587130607.pdf
    • https://cdn.shopify.com/s/files/1/0440/4841/6933/files/87929968871.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0870/files/41453772262.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/adrenergic_and_antiadrenergic_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/zirolorizavizosutotanuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/94838701381.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/fatejetivenir.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/behaviourism_and_mentalism.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/20672647019.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/1284926614.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/oriflame_catalogue_february_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/40615031620.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_off00006070.bin
b667ced5d5a17b1c7798469c26d31f6cda59dacdeb953d9d218d12ac3ed8ff5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 5392 bytes
font_01_sfnt_off000072ae.bin
412bbf8a9896eb4ee6d288baa2243e9d994f29ec3e52e23e04f9bfdf3179a120
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 9848 bytes
font_02_sfnt_off0000946a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x946A 4324 bytes