Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cfd6e727ad960f…

MALICIOUS

PDF

35.9 KB Created: 2020-08-12 16:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e6ee04f372e2f7742b8cba5a077530d SHA-1: 44bf4a4ca939828bbfacb53508b9ddd96bddf600 SHA-256: e4cfd6e727ad960fea49d31b6deb5020a340c3df5f63158512e0b8dd8073ffe2
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=split+merge+pdf+free`. This link is presented within the document body, disguised as a free tool. The PDF also contains a large number of external links, many hosted on `cdn.shopify.com`, suggesting a link farm or SEO poisoning tactic to increase visibility. The primary malicious URL is the most critical IOC.

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/pify?keyword=split+merge+pdf+free
    • http://files.f-cubed.net/uploads/1/3/0/7/130739146/d0e5f293d685945.pdf
    • http://files.stjamesbands.com/uploads/1/3/1/3/131379113/wujalapatiweb.pdf
    • http://kelapu.dumpsterrentalnaperville.net/uploads/1/3/0/7/130776791/nisusad.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/xalorumerejasegup.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/29473971945.pdf
    • https://cdn.shopify.com/s/files/1/0428/5916/7900/files/1221987438.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/administrative_office_management.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/bartholomew_and_the_oobleck_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/vumojipikunabulirawowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/poeme_l_albatros.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/dosis_antasida_sirup_anak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/157454649.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/88246546322.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/android_java_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/boundary_layer_thickness.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_off00004f84.bin
820c45e9562da0be18ad6c72fbd4053e6b492469f33539ee50cafb3b2be08fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F84 5076 bytes
font_01_sfnt_off000060b2.bin
e451bd464afacf2fc90c6f1fbfa0e1f0c19405b8ea6f71fe95b8adf2842b2692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 10084 bytes

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