Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333967691c54fcd…

MALICIOUS

PDF

51.4 KB Created: 2020-08-29 11:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcccc66c00a63cc4ce12c8ee87756a1d SHA-1: 207d6b4704453c39cf952bb31964fcbaf12a9b40 SHA-256: 8333967691c54fcd2686995c2e763fc70844675a7807e93e42d388db84c9c64a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for a free PDF download, specifically mentioning 'microeconomics hubbard 5th edition pdf free'. The presence of numerous external PDF links further supports a link farm or SEO manipulation tactic to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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.me/wix?keyword=microeconomics+hubbard+5th+edition+pdf+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_d9df642da5774e1194a80f0934fb8a8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc54f51267794afc8cbdc6b3a2ef52f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_625f1e9486dd47de80e94b4c554aced1.pdf
    • https://static.usrfiles.com/ugd/b8c837_23a6596119524cc8bfee711c6534483c.pdf
    • https://static.usrfiles.com/ugd/9e41f0_6c5c9945fd0f4063ac4641767d31557f.pdf
    • https://static.usrfiles.com/ugd/b8c837_51cdce691b974b5bbe43889054a00054.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdb8c915d5d04509a775216ffb8b7c2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_43d326701a3c4bb5a17399780abaeaf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_39d35689cf7343b5be459bd2bf20f237.pdf
    • https://static.usrfiles.com/ugd/b8c837_109c11e779594eff83c1b5f4ee0ce557.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/67290382946.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/vekonoxudumutex.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007adc.bin
7fde03f8711685ad550a4bc58df69c94b4d558c0f6b8555fbccd7fec11ecdb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADC 5516 bytes
font_01_sfnt_off00008d66.bin
1fbce342457f7680f6ad64796c976b4ec77d7cd33ee7fd3f8de994bf47e00b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D66 10940 bytes
font_02_sfnt_off0000b259.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 4324 bytes

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