Malicious PDF — malware analysis report

Static analysis result for SHA-256 818de7efca69a99c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 17:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7a368d406fc05befdf206450faaec17 SHA-1: 775196f1bae9f25f32afe71cc329b551cf06b72a SHA-256: 818de7efca69a99c4655b5bbab470844ac235025d37973c9c1ab1a75c8604296
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of malicious redirector links suggests an attempt to lure users to harmful sites.

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.com/wix?keyword=modelo+faria+mello
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0116/files/blank_clock_faces_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/5660/9957/files/subovinigobotuze.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_127ad9de0e584dc4a04621d157952736.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/ncert_exemplar_book_class_11_biology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/attitudes_personality_and_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/ludej.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba1c95c30cf7409fb381c6f1eafe6daf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88e270d8fdc4762b12ab6660146f6e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad0c5470d84547a3b459b64627caf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_656e513a77274f1c97b5d609382164e4.pdf
    • https://static.usrfiles.com/ugd/7d21c0_a8c2c05b9a2d46399807671ce99f51f6.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_off0000517c.bin
2b22387c2e0e6e4bf2e109b4a8a2a64b38501722b06adc5be5cbfb039a31b8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x517C 4484 bytes
font_01_sfnt_off000060b1.bin
ade0d513c9ac31fbfd995b71deff5cb9c9c4f34baccb1ecc7d25996a913be9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 9988 bytes
font_02_sfnt_off000082e2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E2 4324 bytes

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