Malicious PDF — malware analysis report

Static analysis result for SHA-256 689cdb19f53646ce…

MALICIOUS

PDF

62.4 KB Created: 2020-08-30 15:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16129520b5c0991ad7542a3214109089 SHA-1: 5d210e9ee184643c590d41209fbd29a43caf4f0d SHA-256: 689cdb19f53646ce10aabea3181d93ec007d17c79b3038255f38292fc0e934ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'project coordinator interview questions' to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=project+coordinator+interview+questions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_05541944863e4a8cb301cb6a7e10482f.pdf
    • https://static.usrfiles.com/ugd/0789d5_37a62475b3e54e49b379fe6d36491d85.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc2c3690156841729add3e999934dfc9.pdf
    • https://static.usrfiles.com/ugd/0c4177_c4124a4a441b456ca835c932322e47f5.pdf
    • https://static.usrfiles.com/ugd/739437_545ec1e3ed6d4078a2ab7867b665d6ef.pdf
    • https://static.usrfiles.com/ugd/d54300_c3e0c228cdd6482dadff432c07180c0e.pdf
    • https://static.usrfiles.com/ugd/3aca14_bd7aee744dce43a89163cf1710170436.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
    • https://static.usrfiles.com/ugd/09273f_dcbf684a372048a1802e8bee683b554d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9dfcf5f11552475db2c40cf7f05396e2.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/bajuxiwenotedatam.pdf
    • https://cdn.shopify.com/s/files/1/0436/4002/9344/files/vinazunaxanaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/87756050395.pdf
    • https://static.usrfiles.com/ugd/b8c837_709bbebb40af484b85921a52210b3de5.pdf
    • https://static.usrfiles.com/ugd/6cfc61_8a63603b89c44769a7a9901a98677c33.pdf
    • https://static.usrfiles.com/ugd/822ecd_afbfc59f028c442d8882d63e71d406c5.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off00008319.bin
b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 6588 bytes
font_01_sfnt_off00009393.bin
f43cbf5e6a4706b9f6a95b1e2cbac83afd970803080e6455ec6b04765d0261d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9393 5256 bytes
font_02_sfnt_off0000a586.bin
4a7cb244add02a1b68fea71dd8f82eb8ce3375fff077073faa63549213b9916c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA586 2924 bytes
font_03_sfnt_off0000b1da.bin
d68735a958701980287d60821d35be9b13696ab756ca9b2f38196b44755a802d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 10404 bytes
font_04_sfnt_off0000d563.bin
b1a7be413c16529a3efb36790fb1ede9dbc47b99b1dcf399fe3ce16d881d47c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16416 bytes

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