Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a6b3a95ffff4d6…

MALICIOUS

PDF

81.1 KB Created: 2020-09-05 06:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c06a444318bb7bdbc3df8a84e81026b SHA-1: 696879eec3736fa8aec10ab0ddd5fa4d10ccfe63 SHA-256: 76a6b3a95ffff4d6b1eba0191e5b86150cef0cfba9fe5e4ae517d0c2dc5824c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm for SEO manipulation or malicious redirection. The primary malicious URL identified is https://ttraff.link/pify?keyword=yes+no+decision+tree+template+excel, which is likely used to lead users to a phishing or malware-hosting site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/pify?keyword=yes+no+decision+tree+template+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://linux.thai.net/plone/TLWG/thaifonts_scalable/
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/34752219595.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/calculus_made_easy_martin_gardner_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/dufurumeronegamakilokawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/calophyllum_brasiliense.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_728fcbe6decb412c836266f8ce6ea605.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ea6bd7dea6e84e70b210e7965c5d6299.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_9adaaeec52364b65b3a9aa8a93c7b06d.pdf
    • https://static.usrfiles.com/ugd/bb13a2_68671cc4e2e44a17adc3e58bcbe319f7.pdf
    • https://cdn.shopify.com/s/files/1/0438/5931/2800/files/american_yawp_chapter_9_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3164/files/newborn_baby_crying_ringtone.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://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fd.bin
34e79a8265a429a80a9fa9ca00662fb976742c038e381735e813663488c60679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 26088 bytes
font_01_sfnt_off0000b701.bin
2792994b3c2f72ddfa2306af4cec7f9f6fe59bdaf71c58f8ca9511c01b8dc296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 5248 bytes
font_02_sfnt_off0000c8ba.bin
5c73ccb799d9317c003c2cc914a58324c9c96b93d17a1785738fc35c764bd2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 9608 bytes
font_03_sfnt_off0000e3a6.bin
b79d71f36d7b173331807a0ce8610352478026bdb00a2234c8b4f26e4f18d299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 15812 bytes
font_04_sfnt_off00010daf.bin
b97950783618ee55b000e61ef2bf8f5ede64b5c119d487b755d859dce82c221f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 17288 bytes
font_05_sfnt_off00012683.bin
6812578d90a9333fca257c24eb39390812bed8231ce739e947100a78508c9a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 7116 bytes

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