Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7be52ecdcca98e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 11:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5583b1a108928ff2ff6775044848e24 SHA-1: a7186671306ab70934bab30030d1d7ffe4e6cc5e SHA-256: ca7be52ecdcca98ec2611978d2de5afffb1a2de5498c1235774def382bc77940
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.cc/wix?keyword=organizaciones+sociales+concepto, points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or engage in phishing activities.

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=organizaciones+sociales+concepto
    • https://static.usrfiles.com/ugd/e745be_169d62aa48314192b3519cd824d161ed.pdf
    • https://static.usrfiles.com/ugd/ae059d_3cfff57393e1458c8233e10d07956ed2.pdf
    • https://static.usrfiles.com/ugd/b8c837_faef296725b646e9883756a4ebd6396b.pdf
    • https://static.usrfiles.com/ugd/77941b_20218e45ec004af49ca01199877cbb29.pdf
    • https://static.usrfiles.com/ugd/764aaa_ede1bc10e2d04c3bbf5b1a72b62b5d5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38d507272ba4bb5ac3f24534b1883b7.pdf
    • https://static.usrfiles.com/ugd/de65f7_bd8012f9b2ad4e1aa9f7a143a1403a9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ec1d9ee7eac4a38b0657e0d1540be51.pdf
    • https://static.usrfiles.com/ugd/e2b09b_6f5f014b4f4e4c758c0b378ae7a8d789.pdf
    • https://cdn.shopify.com/s/files/1/0451/0603/6899/files/windows_10_pro_digital_license_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0434/5698/7303/files/98751091426.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/15609506192.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/mobalitejilusamiviwud.pdf
    • https://static.usrfiles.com/ugd/696b8a_2597bdfba2ad4548bf9547b9aa4335a1.pdf
    • https://static.usrfiles.com/ugd/0a052f_86355c1a6945466aa573f0bf3c7d769d.pdf
    • https://static.usrfiles.com/ugd/ea78e0_dbf63d74ae824586b8f89f062cc7b583.pdf
    • https://static.usrfiles.com/ugd/52b593_baf47bf04048446cac2842ed29f7d39c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e5d.bin
7a872900679881c24c4d32df8f1afa26ff13f66d07d552845e17bac24f509f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5D 5180 bytes
font_01_sfnt_off0000800b.bin
3942012229fd03c21451875a77cc7dac1d2c29b902edca3397dbcbc73465c827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800B 11384 bytes

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