Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b2efed425df310…

MALICIOUS

PDF

49.6 KB Created: 2020-08-25 01:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0669cf0bdac07fd8bd49b369ab07940 SHA-1: c255a71441dbb091298f2e81edcac24d2daacf80 SHA-256: 35b2efed425df3102a9084340e052b6a35b36bac7b5d1685741744bc13d40854
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL, https://ttraff.cc/pify?keyword=android+antivirus+free++for+mobile, is likely used to redirect users to a malicious site. The document body contains garbled text but also includes the same URLs found in the heuristics, reinforcing the malicious intent. No scripts were extracted from this sample.

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=android+antivirus+free++for+mobile
    • http://files.nascidesigns.com/uploads/1/3/1/3/131380626/294132.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/popurimub.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/62535435508.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/29815315212.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/viruxirekosarobavogerij.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/boat_bill_of_sale_georgia.pdf
    • https://cdn.shopify.com/s/files/1/0437/4223/2725/files/23791691829.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/xefepikagebirokit.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/bufaxafuzuzabib.pdf
    • https://cdn.shopify.com/s/files/1/0438/4351/8629/files/mikedibinarewinemikav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/gemojunirox.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/luwudogewanemuxeze.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/94233181711.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_off0000848e.bin
c4afa6e3191f7726d1d507c86030ec251642f32a78e36857dab07175550d9d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848E 5240 bytes
font_01_sfnt_off0000964e.bin
b753dfbfb79b25f0d8f172fa57f1b9f7538ccaeb4b06ab960c98bf6cfb1f9e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 10452 bytes

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