Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5942dbecc38057…

MALICIOUS

PDF

82.3 KB Created: 2020-09-07 15:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a38d11dd84855c277500129b2fa081 SHA-1: a26b178e7a668d0a6121f734372d7ecdff40b417 SHA-256: 5d5942dbecc38057f358760a9b604b0b78d0a9f54157eeac02322c54799c5b83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to malicious infrastructure. The ML classifier strongly indicates malicious intent.

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/pify?keyword=speech+writing+format+for+class+11+cbse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/37321e_0b113d7ad639448f8762f6bb7046ef7f.pdf
    • https://static.usrfiles.com/ugd/ef7486_5a9a2914d4ff4b9381fae587f27c2b79.pdf
    • https://static.usrfiles.com/ugd/078c79_84b18bbbb485446cb8d8681a8655c752.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/debt_collection_guidelines_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/xekabodapaputex.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7776/files/primary_prevention_lipid_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/98424440743.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/87273503068.pdf
    • https://static.usrfiles.com/ugd/7598fa_4303646667aa4e4d86c2d137ac8166b5.pdf
    • https://static.usrfiles.com/ugd/30e015_b5b5699cdbef4bdf8d0b69861cd6ae36.pdf
    • https://static.usrfiles.com/ugd/f0e51d_7c6852de76e44694a80982f267dac8ab.pdf
    • https://static.usrfiles.com/ugd/d2759c_f2a300daa11b419da31e5e21bb785eee.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e200.bin
0d6cba38866cc65b85f09f6801a3298ba129be16d5f09ffd80510d6e3f484091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5604 bytes
font_01_sfnt_off0000f4f4.bin
f9349ed71fc87d94835ea410e95b738e304d25950860e56b38436af5bc08e7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10192 bytes
font_02_sfnt_off00011803.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16164 bytes
font_03_sfnt_off00012d18.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 4324 bytes

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