Malicious PDF — malware analysis report

Static analysis result for SHA-256 c239c72f049f17d8…

MALICIOUS

PDF

39.6 KB Created: 2020-09-06 06:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b428728b51331ae2b2830aafe7860f30 SHA-1: d747b0c03378e707e091bd47041d4cd67bc4d3dd SHA-256: c239c72f049f17d8c2674963456d7aa50870552d32cf8d106d02b2bd8ff160cf
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to `https://ttraff.me/wix?keyword=google+map+code+android+studio`. This URL is presented within the document body, disguised as a tutorial for 'Google map code android studio'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=google+map+code+android+studio
    • https://static.usrfiles.com/ugd/3ab5ed_bcc02d43d2d44616a3899b9867993dbf.pdf
    • https://static.usrfiles.com/ugd/12f4eb_7c4a0c84fab54c9e857db2f376fc051d.pdf
    • https://static.usrfiles.com/ugd/b1b3ad_6c88407249c14b64b8cbee3800e11205.pdf
    • https://static.usrfiles.com/ugd/fa6f14_d3a8d4eff25c48c28b9e7271ed740af9.pdf
    • https://static.usrfiles.com/ugd/67e251_884f0a06e0524ab8a2cb699d7b128345.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/spartan_race_training_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/2992/1943/files/hills_c_d_stew_feeding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/50121288488.pdf
    • https://cdn.shopify.com/s/files/1/0434/0835/9589/files/41657285703.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/79877203384.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_off00005d7f.bin
7207c3f4196fff971f95db902d81281e2c3273229bab304051ea9957d245b855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7F 5424 bytes
font_01_sfnt_off00006fdc.bin
45946cbdb5cd2cd39079825e9de0011f136597e2d454cbae5276adc68db45fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDC 10040 bytes

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