Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f913e3075bd2a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 06:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18718c6f7f9d5dc0700257b0d4c54fb SHA-1: 4eccf849840d42f31bef6895ed53495590fc2e12 SHA-256: 3a4f913e3075bd2ac8bb24f103be556f63e3cad850e8898594f9a9166c341b78
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded external links, indicating a link farm. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=gta+for+gba', which is likely used to redirect users to a malicious site. The document body contains garbled text but also includes the same malicious URL and several benign-looking PDF links hosted on Shopify, suggesting a lure to download further malicious content or engage in phishing. No scripts were extracted, but the PDF structure itself is designed for link distribution.

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/wix?keyword=gta+for+gba
    • https://static.usrfiles.com/ugd/33ab24_1f49663f22b3498e8b1849f5ac422298.pdf
    • https://static.usrfiles.com/ugd/3fc21f_fdf70efb203a45d68c5622c07aaee2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05f0c953a8b45b883990788c19958dd.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/pubizuxurugemosit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/98791009646.pdf
    • https://cdn.shopify.com/s/files/1/0459/5456/4255/files/arya_2_malayalam_movie_ringtones_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/calligraphy_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8865/8078/files/pibavavow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/18226902125.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/98365034702.pdf
    • https://cdn.shopify.com/s/files/1/0448/4084/5469/files/water_bottle_manufacturing_process.pdf
    • https://static.usrfiles.com/ugd/b8c837_c802f908fff94ecfb8e5cb5236a1af91.pdf
    • https://static.usrfiles.com/ugd/2f8cea_a857f172095842abb0c5a5993e3d5902.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_off00007271.bin
501d25369c0f6767c9edd6488086d17896cb49de5c1764e5ccd780374643b3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 4896 bytes
font_01_sfnt_off00008337.bin
819e9dcca10a421ccf75bcda662d19b5fff21897228844048c5bf30defaf95a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8337 10468 bytes

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