Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2720e4b7a57facc…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 10:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009731b359f3fb28a967f5fa4c063f65 SHA-1: a79e76df6935573dedb57a49125caf5131cbbd4c SHA-256: c2720e4b7a57facc75bfa9e5d327013382ed6ef7dc72180592ec13f1846c794d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a direct link to a known malicious redirector at https://ttraff.ru/wix?keyword=number+line+1-+10+template. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting the primary goal is to redirect the user to malicious infrastructure. 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.ru/wix?keyword=number+line+1-+10+template
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/21387147686.pdf
    • https://cdn.shopify.com/s/files/1/0441/3833/2312/files/mack_the_knife_sheet_music_tenor_saxophone.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/cancionero_folklorico_argentino_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/fix_loose_headphone_jack_android.pdf
    • https://static.usrfiles.com/ugd/79e5df_7d097c7d8b7f45fd8f1b6c0242837cfb.pdf
    • https://static.usrfiles.com/ugd/70a38d_55fbb55d291b4b97b87e4cc6a3e9028d.pdf
    • https://static.usrfiles.com/ugd/b8c837_39eeba0d4fee4244be935df4fb142883.pdf
    • https://static.usrfiles.com/ugd/b77b08_d5a72c407a5d4f728316175608d62e36.pdf
    • https://static.usrfiles.com/ugd/41a0b6_01a0df1dbb9e4bb38790e2a466dd395b.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/gufibefetedulizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4197/files/37087403718.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/bacillus_genus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/26826803469.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/swot_analysis_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2651/files/89017849682.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/38951232934.pdf
    • https://cdn.shopify.com/s/files/1/0459/9228/0223/files/manga_studio_debut_4.0_download.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_off00005c72.bin
f826e64fedddace395d0246a8b04212dd6e22cf9e754513a0b845d32de53517a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 5120 bytes
font_01_sfnt_off00006dd0.bin
037d1e228a1d611dbae44018b44f1743143e01cf2030b978e28dc6dc7f35c8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD0 10036 bytes