Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef34ebd6169a7640…

MALICIOUS

PDF

33.0 KB Created: 2020-09-02 15:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0021d53b2086224dbd0a418179ba8711 SHA-1: 2934be7f0283fc3224c2afee96c56ce1343e00f7 SHA-256: ef34ebd6169a764040c8f49ba5d703bcdeb3606a9819d04484cbb41343e34a5a
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 link farm. The primary malicious URL identified is https://ttraff.me/wix?keyword=chita+chola+see+darzi++song. The document body contains garbled text but also includes the same malicious URL, suggesting it is intentionally embedded. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to obscure the final malicious destination or for SEO manipulation to attract victims.

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=chita+chola+see+darzi++song
    • https://static.usrfiles.com/ugd/b8c837_2c11272175974cbb830bac88bda7f0e5.pdf
    • https://static.usrfiles.com/ugd/b1277d_c5e0a4a06c114163a21fd3edb6075a4b.pdf
    • https://static.usrfiles.com/ugd/724fb5_f12f98f587c34f8aa5891b2a77087301.pdf
    • https://static.usrfiles.com/ugd/b52961_d9befe12b3d140fdadee609d2db160d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_22f20fd1762a4057ae04fd19e1d84c00.pdf
    • https://static.usrfiles.com/ugd/804ff6_e35fba1b85a8495aaea9a3559e668f38.pdf
    • https://static.usrfiles.com/ugd/65b209_a6185f8251114e5e83d5fc57bda40320.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_18ede5e38fe442c38f1105effa5726c9.pdf
    • https://static.usrfiles.com/ugd/f8de3e_9ec83070fa83481ca175f96da2305451.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/vukakisorik.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/form_validation_using_angularjs_on_button_click.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/95486437607.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9165/files/80425418338.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_off000041ee.bin
50a01c0f1e8b1f49bec8ce70bafe133006674a54c77b18a8d3bb10f1bf2a752b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41EE 5156 bytes
font_01_sfnt_off00005371.bin
567d8324ed09b64a0db91044d3c1d62c6ea45cf9ddaacdd4b7a5f093c7fbd065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5371 11400 bytes

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