Malicious PDF — malware analysis report

Static analysis result for SHA-256 796e3dd96cf8cccf…

MALICIOUS

PDF

50.7 KB Created: 2020-08-19 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cc8daf1446def0c888bb571b937fd00 SHA-1: 4bdaefcf4b0ade3ff4f63fe6dfb13fdde4ec5758 SHA-256: 796e3dd96cf8cccf0767e71079a59840ed5380eac0b326b8d89ecd2461bba156
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many pointing to potentially malicious redirectors. One prominent link, 'https://ttraff.cc/pify?keyword=user+acceptance+testing+feedback+report+template', is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar text, suggesting a lure to trick users into clicking these links. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=user+acceptance+testing+feedback+report+template
    • http://files.berrysgardenservices.co.uk/uploads/1/3/1/4/131437504/2971024.pdf
    • http://posev.majesticeggdesigns.com/uploads/1/3/1/4/131482995/b7068.pdf
    • http://wewifizal.annkellettghostwriting.com/uploads/1/3/1/6/131607240/tosevipemegutak.pdf
    • http://liduto.witmanlab.com/uploads/1/3/1/4/131437689/milojigap.pdf
    • http://files.triadsbesthvac.com/uploads/1/3/0/7/130740429/e6ffc21eed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5304/0295/files/4_3_under_defense_playbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9763/files/51599883957.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/fuveg.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/free_trumpet_ensemble_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/4341/3407/files/briones_regional_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/sefalexixifib.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/letabit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8077/7882/files/zawuxinoterebonate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/zonemenozevuxemeruxibobox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0437/3564/6357/files/56913601226.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c41.bin
5dee63d9b61b9159e5834338f71cdc043740879309ef457006f7e86ec04563b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C41 5672 bytes
font_01_sfnt_off00008f71.bin
542935cd5f763d2ad0165c15aa02bc0c9ec065def6b400266058a82a48e80f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 14580 bytes

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