Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b195caa8b15f1f…

MALICIOUS

PDF

48.8 KB Created: 2020-09-05 04:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a565ebbedafaa4c30e00488e7eb51475 SHA-1: 0ead6e8e60c3bde6628fd6d23ef3a0fe8f0ac389 SHA-256: b0b195caa8b15f1fefb5bcc54b9e157dc3494dc7fe771392c7229f13a2baca79
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. One critical heuristic indicates a malicious redirector link, specifically 'https://ttraff.link/pify?keyword=3d+object+viewer+android'. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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.link/pify?keyword=3d+object+viewer+android
    • https://static.usrfiles.com/ugd/ff2e72_35cbaa60f9434e53ada0c46c900a61be.pdf
    • https://static.usrfiles.com/ugd/f1780b_5058cfb25cf74fc994c8cfc54315b2a3.pdf
    • https://static.usrfiles.com/ugd/529385_c363f7881b4b420a9c7c9accd76b5ba8.pdf
    • https://static.usrfiles.com/ugd/10e3af_4ab1cb9c8f9744ec8dacb10e238f98a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1c9d490aab846f5b80f94d44adeccb7.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/ada_diabetes_diagnosis_guidelines_2017.pdf
    • https://static.usrfiles.com/ugd/9a242c_66bf2ba510fe4761b75cd20d4ff55b3e.pdf
    • https://static.usrfiles.com/ugd/19103d_d4fe3a7714814850a8bc8b6e511d509a.pdf
    • https://static.usrfiles.com/ugd/800b88_663fea65489b48e3a9579214af408b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b82d6f5d1dbb47118c68a5ff1168ab42.pdf
    • https://static.usrfiles.com/ugd/50c35f_b9994d9a80404d3ebf912adcf9d453ec.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/rupuzevawuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7251/files/boishakhi_tv_natok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/zisaberusazov.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/lopotilegup.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/bloodborne_bloodletting_beast.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_off00007e7a.bin
4d51011c98a5f15cb3edd138e5d4c08b402a54370546e40a7c63224a7a3cda5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7A 5160 bytes
font_01_sfnt_off00009029.bin
b5f99ac3b5b58913172d775b30ec754c5c82c48cade4a51d69e36c599f55632a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9029 11668 bytes

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