Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bc4b5d34cc3117…

MALICIOUS

PDF

58.8 KB Created: 2020-09-01 04:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97ad20ea05de63a386e3b700143c3640 SHA-1: 4bee4ae6146c6238365725139f116ca33c2815b1 SHA-256: 14bc4b5d34cc3117dc04d8a4cc399bb3e1a3485d7038ac6fe6ce418d3af60c26
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic answers, likely intended to trick users into clicking malicious links. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

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.ru/wix?keyword=aleks+math+answers+s
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ae059d_6fe68a88314f4c74924fd9607cc8b4f7.pdf
    • https://static.usrfiles.com/ugd/6a7407_d44364aee464412694a899c08b974609.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5dd5b56f6ec452c817aecb991107b83.pdf
    • https://static.usrfiles.com/ugd/daca0d_30c993d95ad648d88f152ec2c4f272d2.pdf
    • https://static.usrfiles.com/ugd/3794ad_e52936be830f416ca224bba2525f2e36.pdf
    • https://static.usrfiles.com/ugd/b8c837_7910ecf8492747a98f9ddf053568d30e.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_30b62682e41d4791a68edb195b16dabc.pdf
    • https://static.usrfiles.com/ugd/b65acf_554f3ba4417e47e7b9f9a7c043983227.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9928/files/82717566332.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/mozagizalomup.pdf
    • https://cdn.shopify.com/s/files/1/0439/9320/2846/files/godibokomatujudowome.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/rexelejawimut.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0c.bin
106d6469768ad7075d205854f8c85685c54aac476ed61e8b9e82b74d815b2540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0C 3092 bytes
font_01_sfnt_off00007913.bin
fdbdeb22b0f6a393011fba9262e650b8f50bb418e1f580fe19427c1c61730df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 4700 bytes
font_02_sfnt_off000088da.bin
51844236147348bcfab15bd931ba11654aee8f0c9d60d62e246dab3cb0e14779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DA 12532 bytes
font_03_sfnt_off0000b330.bin
4c6bc0e14aa5b0d518ea0f1d35b9262e21594e42a0ec46d1577a8aaff455d2cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 18588 bytes
font_04_sfnt_off0000d000.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 4324 bytes

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