Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc5b5891cccc45a…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 18:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea8dae311e4870fb5cb15c4620b301d SHA-1: 2a76d91963e5175e336845418f0d7ad89043cafd SHA-256: cfc5b5891cccc45a32dc01affd937bc92d984f8a9caba9cf84bf0214fb26ee54
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=hunchback+of+notre+dame+musical+sheet+music'. This URL is presented within the document body, disguised as sheet music, to entice users to click. The PDF also contains a large number of external links, characteristic of a link farm, further supporting a malicious intent to redirect users to potentially harmful sites.

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.me/wix?keyword=hunchback+of+notre+dame+musical+sheet+music
    • https://static.usrfiles.com/ugd/18f527_0c60093306234200ac16cfe959d3b1cf.pdf
    • https://static.usrfiles.com/ugd/0a0016_a0372c5193c44150ae9538c431e06f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d26cb12c52a44130914d4c5577b4c534.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/63490623720.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/moburerinisetogolevitalok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/fubituvewos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/64326253488.pdf
    • https://static.usrfiles.com/ugd/a4e402_9967514ab0b847f78821fd74fb51a3c8.pdf
    • https://static.usrfiles.com/ugd/af0aa9_70ab3ac65aff4d9fbda073c74b7e3dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2959945006774553958c5b15a32d6e16.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/30587251362.pdf
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/35007331131.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/32057349263.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/bethesda_bug_report_fallout_76.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.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_off00006880.bin
67b6ca0a630ba88afa8884f663e9404a17a7001e9603c67e997fad9e855d8fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 5308 bytes
font_01_sfnt_off00007a4d.bin
c8c7aaee177ce9c87b70d52c3e21d20f9f2a2b7aefedcac516f42eb2d2eb21da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4D 9908 bytes
font_02_sfnt_off00009c48.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C48 4324 bytes

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