Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b24965a3326844…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 12:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889871b39264921d78e601183d9db313 SHA-1: af149d0bb73c6f07e121227c91424b00f7b221cc SHA-256: 86b24965a3326844248f538158be64cdd4fa0cf15cb9ed8c6bee8bd6e9afcd74
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The document body also contains a call-to-action phrase, reinforcing the lure. The primary malicious IOC is the redirector URL.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cdr+file+conversion+to+pdf
    • http://files.couplematters.org/uploads/1/3/0/7/130738719/bapudexi.pdf
    • http://files.sergeseiden.com/uploads/1/3/2/6/132681378/3205763.pdf
    • http://files.tigerphysics.org/uploads/1/3/1/4/131437680/995578.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pezudatilekubad.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/50781573461.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/tezatozimegesubibibiwuka.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/arnold_encyclopedia_of_modern_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/xiwavaterozip.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/tax_rates_for_ay_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0439/4457/5131/files/jokikolekatezewik.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/puwaxasuwezupuvedemudobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/carcinoma_escamoso_esofago.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/wojenuxijonoriloxulape.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/1886454071.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/xijadofewezegazos.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_off00005efd.bin
8d5996c262576a6fad6fc07ad7f34bd166d1caf7cb2514b426c67e5935baa538
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFD 4904 bytes
font_01_sfnt_off00006fc2.bin
e719e00653457f2e8ba0261d96f37ad00dd81215af4c5b61d537ef7471a7f05a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 13044 bytes