Malicious PDF — malware analysis report

Static analysis result for SHA-256 0736d89e749bba69…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 15:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87a30b1905607687108b8f44d8e62dec SHA-1: fac12ab255a58be314c8d30ce52056802ba09666 SHA-256: 0736d89e749bba6996a06354c8f51b6c63f920775ab746d05d0023a4700a0155
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same malicious URL and appears to be generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The presence of numerous external PDF links, many of which are benign, suggests a link farm or SEO poisoning attempt to mask the malicious URL.

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=god+of+the+oppressed+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_839798b4cd984c068e33bf5e1ff58a84.pdf
    • https://static.usrfiles.com/ugd/b8c837_d14c48d4c1664a3da4a58274d6d36e87.pdf
    • https://static.usrfiles.com/ugd/b8c837_a97515deabf44a8f893645208f2536d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb48b2bb6e89477e84b4f4b180b3be05.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/81_country_code.pdf
    • https://static.usrfiles.com/ugd/b8c837_f66ac0daeb2f408eb6c9e2a914be82ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd587d567d54cbfa75066e5bd6bfa59.pdf
    • https://static.usrfiles.com/ugd/b8c837_c22b1b2e990942fdb564d53f60248541.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1982beb60f4633a0fc9de9b3d86fd8.pdf
    • https://static.usrfiles.com/ugd/3f0e57_9be88b21eff34aed8645944bf5a3aa69.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5adc04bb8e148e19018b756e5eab315.pdf
    • https://static.usrfiles.com/ugd/0c41e7_3f688d22f18a43febc79c94565f2a180.pdf
    • https://static.usrfiles.com/ugd/b8c837_85aecc8df6674150ab51778ad6bada5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba583d41c11a41e580bb52d87c529493.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_off00006135.bin
5109517e2110fe00948908aa477c201f1ec3370f0efb0de83a3273b87a7f432e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6135 4552 bytes
font_01_sfnt_off000070c6.bin
a5517496d7450759dfea2646b354717d53a6ac7399f66dd73e27ccb8adee2121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 10348 bytes
font_02_sfnt_off00009393.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9393 4324 bytes

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