Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d034c0fc3ccf4e…

MALICIOUS

PDF

50.7 KB Created: 2020-08-03 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be7984a5dbcadc21aaff5c87ae0fb988 SHA-1: bee051527e2e99637ce92b9d370cd31498f401bd SHA-256: 99d034c0fc3ccf4e4c22c3b0f002bb7b8414da6884fdd6274ac88da0bb626199
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded links likely serve to obscure the ultimate destination of the malicious content, which is a common tactic for phishing or malware distribution. 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=background+image+opacity
    • http://files.burgandysings.com/uploads/1/3/1/3/131398360/3c03613db03b43f.pdf
    • http://files.daviegaragedoornc.com/uploads/1/3/1/4/131437822/2306286.pdf
    • http://files.cebhalifax.com/uploads/1/3/1/3/131379343/pudutipenim.pdf
    • https://cdn.shopify.com/s/files/1/0432/0804/8808/files/jezesowo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/tikogedewikizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/8944075887.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/92930326906.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/gipimu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/wokevagegaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/lotolumuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/wubivogumogumebilatazat.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/xofirurobuzijakekonibilod.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/dejorenusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/kemulizowavo.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_off00007dbc.bin
36c60975d12d3279d8d147860986817ede788564ef1f082cbfcde169c75eb8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBC 5396 bytes
font_01_sfnt_off00009011.bin
fda5d41916f971014a8c05d5864fc2718b5c3ad4676075b5972d5fde9a6258c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 14180 bytes

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