Malicious PDF — malware analysis report

Static analysis result for SHA-256 77deddfd769a7619…

MALICIOUS

PDF

56.6 KB Created: 2020-08-29 09:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39799fe50197886c876a3368282de678 SHA-1: 926d7b452aec9a022bcd3c44be8895296fc96e98 SHA-256: 77deddfd769a761988eb6e2652d59b493c466284d88f6889ee8b4fd123a7cfdc
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially garbled, contains the same URL found in the heuristics, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted, but the presence of malicious links is sufficient evidence for this assessment.

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=same+soul+many+bodies+malayalam
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/gabapizokebogi.pdf
    • https://cdn.shopify.com/s/files/1/0450/3198/1220/files/49239406207.pdf
    • https://cdn.shopify.com/s/files/1/0434/8238/2502/files/39428073790.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/pogaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_78053507305a4319bb910a4fe9f57aff.pdf
    • https://static.usrfiles.com/ugd/b8c837_96a9542bb98a4523af1b387324864f68.pdf
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/b8c837_2feb2f00adbc4d52b2ca40b7817f0849.pdf
    • https://static.usrfiles.com/ugd/b8c837_c19cd60ae07f40c994fe66c297c2a607.pdf
    • https://cdn.shopify.com/s/files/1/0438/1533/8144/files/81817356238.pdf
    • https://cdn.shopify.com/s/files/1/0437/7034/7677/files/bojipekesipewatolekonajum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/quality_assurance_plan_for_construction.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/giallo_movie_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_e320280654c84fb89998e5a5cb402258.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b8472b5931f4c70b0af256d32544c98.pdf
    • https://static.usrfiles.com/ugd/b8c837_c47e28b1404b461f9bbef76a301e747c.pdf
    • https://static.usrfiles.com/ugd/b8c837_972a347c37134841bd889e0d19d56688.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://gitlab.com/smc/meera/blob/master/COPYING
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00006ff9.bin
5aad28442a0c7fe28e3251f3bf72f2aec9a97135838bea871830c61bd83d37de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6FF9 18504 bytes
font_00_sfnt_off00005e51.bin
ae35ae4c7ecb4e84498b3cc34450de8ad453073afdbed3706ace9eb7c86c1676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 5220 bytes
font_02_sfnt_off0000a8cb.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CB 1936 bytes
font_03_sfnt_off0000b20a.bin
33a629458b6b2c450be8f1d45b7106bd84c10485b01a3972f84e33721faa9f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20A 10032 bytes

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