Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a8841c06c8dd1…

MALICIOUS

PDF

58.1 KB Created: 2020-08-30 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3183fce61888f18dc295fbb2eb2ad363 SHA-1: 9749c8d851095a5bbf0f5f35b2fe0c85a9141fd2 SHA-256: 156a8841c06c8dd11c69f9cebf776fcd7dcae5006694a132ada1a16b908cdce8
154 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also features a large number of embedded links to external PDFs, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and a URL that appears to be the same as the malicious redirector.

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/wix?keyword=giorno%252527+s+theme+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/f80014_645e58fc807f45d8a68ae87ff0d46a0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1f308bf5e34aafbe3b8548f13ecdf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_21b9ebe27ef7402f87e0d0f199e9f391.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://static.usrfiles.com/ugd/b8c837_f51b578cdb8a458c946aa13a31110476.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f19fccfaa3946ce9e5e591fb39577f8.pdf
    • https://static.usrfiles.com/ugd/c1615c_f90b1e027ffa43d4ad123504c2397546.pdf
    • https://static.usrfiles.com/ugd/b8c837_749827de5268404b836fd0d1bf8d7952.pdf
    • https://static.usrfiles.com/ugd/09273f_083aecc4782d41bca46e8b6e3c2ff2ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc892b3cb714e0c94ce61acef817458.pdf
    • https://static.usrfiles.com/ugd/2e79a6_48880551a0ea440ab920b4996a6b41fa.pdf
    • https://static.usrfiles.com/ugd/de65f7_1a0d93ce0a0b45e2901083aad4db871b.pdf
    • https://static.usrfiles.com/ugd/b8c837_abc924ab436a478fa42cac534a7d5361.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://static.usrfiles.com/ugd/63d3ad_58494e078b27413ab368865e37cf4e2c.pdf
    • https://static.usrfiles.com/ugd/87d215_8e4687a31e6c4826a3537c7ce5d16b60.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006989.bin
96920e121910b07f5b211ce00e826817c126ac1ecc0c74ce13dd6b657d25403a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6989 4744 bytes
font_01_sfnt_off0000797a.bin
3d4525c28c8ce087c56240fce1edc040dcc1089b3de720bb65fa9d878b165a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797A 2336 bytes
font_02_sfnt_off000083e7.bin
3ff9144372f038a26dcd1ebf8695f483e8691b474e898d322a75cf9da737b54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E7 15724 bytes
font_03_sfnt_off0000b595.bin
9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 16060 bytes
font_04_sfnt_off0000ca2a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 4324 bytes

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