Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c81c897cffb47ac…

MALICIOUS

PDF

93.3 KB Created: 2020-09-13 01:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 393323945de6deeb8416559730c7c849 SHA-1: 554dc56653333d7b15a3bc36b70a0c17ef4f766b SHA-256: 5c81c897cffb47ac22391193f009b824d77dbfb1bf7958aaecb0fca0b39ee6de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for game-related content. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

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.ru/wb?keyword=fruit%20ninja%20game%20unblocked
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2e16aa_36492180c47d4163ad8303643ca22103.pdf
    • https://static.usrfiles.com/ugd/9e41f0_2eab0882858047439d645738c361de62.pdf
    • https://static.usrfiles.com/ugd/69695d_0a641a7f993c4e49af8a7f026e3bfee8.pdf
    • https://static.usrfiles.com/ugd/02beb7_4f8d2d7691f24edfbbc93af04f403cdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_62de667f83a548d18f15d58114afdbd6.pdf
    • https://static.usrfiles.com/ugd/69a512_04f833ed9e814f84b0e7b1a84c150e57.pdf
    • https://static.usrfiles.com/ugd/5b9365_bb126de62b9f415680a9064248e30abf.pdf
    • https://static.usrfiles.com/ugd/6e3131_0cf1c194596d49b9a20fd31dbe281f4d.pdf
    • https://static.usrfiles.com/ugd/a18aa6_d9258ca0f8bd4a7a8d621aeb8c5f788e.pdf
    • https://static.usrfiles.com/ugd/defcb2_d840b864377140d09c655789c2aa09a1.pdf
    • https://static.usrfiles.com/ugd/9dda13_78c0ace24ff54514b8c1b776bfd7e51a.pdf
    • https://static.usrfiles.com/ugd/b916f4_74d17b4663784f9092e00eb4e1b02105.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_0d640effbc584fd0bc232c12c01a5980.pdf
    • https://static.usrfiles.com/ugd/1715bf_19931fe33dcf4802b34bf6bd3bbf9a15.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://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off00009c0d.bin
63b56845cf9a0b63bd1e0c615a76e231494e07ce049a896d11879254b756f20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0D 6676 bytes
font_01_sfnt_off0000acb4.bin
d8d787b0058eba608f15294068ebace69398182027f73a5b4d2b4e745afe6c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB4 28768 bytes
font_02_sfnt_off000107d2.bin
4466ffc2cd4304af7cd0dd2e4fe73736509f2add180a2b9ee5e0655f281638b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 5316 bytes
font_03_sfnt_off000119da.bin
add90099d69b49c7bdad36d20a97c5b627fba592f8d570c94857107695da7802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 17116 bytes
font_04_sfnt_off00015077.bin
1fa9529675fb579510bab96d7d11babd18a9e6169d8641d84f2873b6b8d19c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15077 16556 bytes

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