Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870e4d3dd0a1b0c…

MALICIOUS

PDF

54.5 KB Created: 2020-08-31 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a05abed29ded9ce31441af7c3b3334 SHA-1: 50064fa658f6691def8d26c7362a8251fcf541be SHA-256: a870e4d3dd0a1b0ce231b0e958dfa6a460a70f4d683c79711c7ff39b4fad89ad
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 a malicious redirector link and a large farm of external PDF links. The primary malicious URL identified is ttraff.cc, which is known to host redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and numerous other URLs hosted on cdn.shopify.com, likely part of a link farm designed to improve search engine ranking for malicious content.

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=cayo+valerio+rufo
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/lukizulalame.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/50565971198.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/65794734123.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/miwek.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/90572036682.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/77183659416.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/pimedodesoligudabidubopid.pdf
    • https://cdn.shopify.com/s/files/1/0450/0403/0120/files/a_level_physics_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/adjusting_entries_in_accounting_examples.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6749ae73bce4fd8b2c312012ea23b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1051cfef36f94ce0a3dd8c5520d696e5.pdf
    • https://static.usrfiles.com/ugd/73c254_6a78aae0f41e478abb8157da2716db9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_11379d7a8890430e905fed50481531c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d397ffd1d1e4525ad133c0691dc4ed4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1e337cd6fd4260911a757f1980cbd0.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_off0000786e.bin
bdd8def7b5c201511c3454cfff9dfae441d089012950e6b65947cbd44a427153
pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 4648 bytes
font_01_sfnt_off0000885f.bin
f1c4a67a5878a1ffd85b6b8d529a9d2fc82ba010070949a455b43ad14d32dffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x885F 12104 bytes
font_02_sfnt_off0000ae31.bin
cd88436c9d79fa925c99bea3bb1239758ec98974df76a06060237a91cbc80f35
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE31 18732 bytes