Malicious PDF — malware analysis report

Static analysis result for SHA-256 582b56e8bea13890…

MALICIOUS

PDF

63.3 KB Created: 2020-08-29 10:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8051f9c1ef2eb521116f02089b84493 SHA-1: 302c2d021bc6fd5829d535b6794367e1243999ec SHA-256: 582b56e8bea13890ad1ea00e83783a683cca2aef528e5ce2d4fdaf7ad010aa4b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used in conjunction with a SEO link farm strategy. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=fundamentos+de+finanzas+pdf', suggesting a lure related to financial documents. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=fundamentos+de+finanzas+pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/22926800914.pdf
    • https://cdn.shopify.com/s/files/1/0437/9122/0887/files/18081095203.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6383/files/5th_grade_addition_and_subtraction_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/insanity_nutrition_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3614/6855/files/zifupupilupupiboxosix.pdf
    • https://static.usrfiles.com/ugd/b8c837_40eb60b50abe44e692d1f16c1938b99b.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/zabenowep.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/legusinegojowutanadim.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8553/files/66242025594.pdf
    • https://static.usrfiles.com/ugd/b8c837_535d5e5d905d4592bf1b433bcf1437bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ae5b9fda44486e9c06b3ae4c9525ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_44e0ba3334f64d47beeeb561eed61a33.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ae035b272045479be49a6e15ce87e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d1465147984e98a0fc0aa581cad539.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_off0000a696.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA696 1696 bytes
font_01_sfnt_off0000aec0.bin
934fcc2c6dfb41a41fb5c5645c7e8860c995e7ec8c1f562be920dcfe6013b486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 5064 bytes
font_02_sfnt_off0000bff5.bin
3347ef6f672c30b572c3649794c467a8cd96e8eb10d0b1304c69f5d42b4178ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 15780 bytes

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