Malicious PDF — malware analysis report

Static analysis result for SHA-256 556c55e8446a62db…

MALICIOUS

PDF

71.3 KB Created: 2020-08-31 22:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8423192715f3d7edeac7201aae453674 SHA-1: 88747c41402f4151d9747a4f400591c108ea4e11 SHA-256: 556c55e8446a62db92ad75aa40433c6d2806bad17722e38312a037fe3c626071
128 Risk Score

Malware Insights

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

The PDF file contains a lure related to "absconding from work letter format" and embeds a large number of external links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=absconding+from+work+letter+format as malicious. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, with the first being to cdn.shopify.com, suggesting a link farm strategy. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/pify?keyword=absconding+from+work+letter+format
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/list_sheets_name_vba.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/linuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/16625244532.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/vikuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8563/4463/files/practical_bacteriology.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/57456936211.pdf
    • https://static.usrfiles.com/ugd/253000_3d02e877e6e54e53a6e26940f2cae6bb.pdf
    • https://static.usrfiles.com/ugd/22739b_8ba17ba8ac544f2a89d89f65c24e550f.pdf
    • https://static.usrfiles.com/ugd/80c1db_9de31e7166284b338cddea7324cff287.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d7181c1157d4d9a84a6df8d0bfb831f.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/26092753114.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/tableau_d_accords_guitare.pdf
    • https://cdn.shopify.com/s/files/1/0441/2506/1272/files/p12_to_pem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfab.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 2828 bytes
font_01_sfnt_off0000d9a6.bin
cf1f1bb2e7928bc4fdbf8a54a84809dc915b481c35952e57ce9e7baed062c7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 5628 bytes
font_02_sfnt_off0000ecc8.bin
c7f45eb9b29ab42c48da536e36d80bd638d19bfad3e8afe3219d8b19b6e248a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10256 bytes