Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ea2bf781414292…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 02:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8dfefc2fdc3124dc0f556e8206d4666 SHA-1: 5362f608a5c766a074450eca597fbbcf2e48f971 SHA-256: 61ea2bf781414292138514058b438e92168347fbe2843a342bbc3024f2487b2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body text is minimal and appears to be filler, likely intended to mask the malicious links. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=new+english+file+elementary+test+key+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0703/9912/files/97106363757.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/wejigizoribiji.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/kizivurijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9537/5524/files/lezez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/4619316641.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6b5c9e69a094842918f2183ba34707f.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/xebolodopawimidonoworatax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/accounting_adjusting_entries_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/fitokap.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2805/files/carnatic_music_varnam_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/13253263916.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9209eeff2e4894aded3050dffe764c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62c544c6b27459db7f4b7e1f6e53453.pdf
    • https://static.usrfiles.com/ugd/b8c837_685f764df56043f5906e98e4183beb37.pdf
    • https://static.usrfiles.com/ugd/b8c837_4425d740eecb4d4791d468f983017618.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b5a.bin
a4aa7e077632502779532d9ddcf6531a3754e78c6d7362ea45e3d9d6a7b887f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5A 5680 bytes
font_01_sfnt_off00006ea4.bin
df76b5701b3995467a6259c3f2c7181f50cb7dac50a96a15f8c16f9d2d877394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 10016 bytes
font_02_sfnt_off0000911e.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911E 16312 bytes

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