Malicious PDF — malware analysis report

Static analysis result for SHA-256 364392e65bead7b1…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356a5ee62d40fd39f524bb47d23e7b6e SHA-1: 524b16c4eee2deec5516fee36af342803bdd2a45 SHA-256: 364392e65bead7b1f40100c6cf4c2089539c97ff4a04112ed7b691a2c0d68207
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=lagu+baby+shark+r%2526+b+remix'. Additionally, it features a PDF link farm with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links, suggesting a lure to disguise 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=lagu+baby+shark+r%2526+b+remix
    • https://static.usrfiles.com/ugd/b8c837_14f1dd89131c460bb4c0268c1c5dedf3.pdf
    • https://static.usrfiles.com/ugd/b65acf_82feccdc627d4292a49f98becb3259ca.pdf
    • https://static.usrfiles.com/ugd/96bf9d_bd529ff6be364db0885735170776571e.pdf
    • https://static.usrfiles.com/ugd/4dd980_f613b648a98442bf83f841ccbb35dcaa.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_cffc4dbaa4f94c23b689f27f7bfdfff1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c1f3fb7df974c00b7f3a8f0f9b5b514.pdf
    • https://static.usrfiles.com/ugd/225520_72df9986c66d44548d1e8731f79169db.pdf
    • https://static.usrfiles.com/ugd/0d089b_cb12ab07b0de4328aa7dbc04acced0c9.pdf
    • https://static.usrfiles.com/ugd/fd3290_6bb1b41a1c4d46d3b85736140cc85db1.pdf
    • https://static.usrfiles.com/ugd/b77b08_e0302c20a5f94cb6822190c9a749b088.pdf
    • https://static.usrfiles.com/ugd/09c3c7_19b8b2fe71d243559397adb3ce81fc57.pdf
    • https://static.usrfiles.com/ugd/b8c837_245ffa7f2bc344569f12a01034556000.pdf
    • https://static.usrfiles.com/ugd/dc98cc_21ac90a61c1e459fbc1e2a0718fa57d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d9617a8c86423a9f1b3d48f3c18a84.pdf
    • https://cdn.shopify.com/s/files/1/0429/0743/5167/files/3._5_e_character_sheet_editable.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/24524630151.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cdd.bin
22fb89f9ec78f4b9aab25a838e493c46925b4a4f0d0d5ab62a9c1e83bfbdfee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 3444 bytes
font_01_sfnt_off00008948.bin
73dd1aec443423cff4d04251130896332c1d6c6e3ec3e7c31eaca4f863718e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 5164 bytes
font_02_sfnt_off00009adb.bin
58a739ef47ce9911e9fc6ce036c75cac9b275cb5ce4dc15b21c8e158a80d601f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADB 10712 bytes

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