Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a59cc182fdf51bd…

MALICIOUS

PDF

53.9 KB Created: 2020-09-01 04:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ecc3e4687357db0bcd05a9ac8aabc7 SHA-1: 7bc282b197aac68c4de5e7d1f4e0fc9874abaced SHA-256: 7a59cc182fdf51bde287d81425f6c693992d1f1f4d23b7a8a38e0ff5b7feec9f
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link. The document body and embedded links point to a URL that appears to be part of a link farm, specifically advertising a 'classic shell start button skin' to lure users. This suggests a social engineering attack aimed at redirecting users to malicious content.

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/pify?keyword=classic+shell+start+button+skin
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/game_bar_presence_writer.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5159/files/51266036312.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/92975031401.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/numasilafuvoweti.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/sozedirekumudaxenutiwevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/nakefufekobavupina.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/44202247349.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66456909559.pdf
    • https://static.usrfiles.com/ugd/be19e1_1754db4daf5142aaa5ff80d438ef15b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b08baf284bd45c2bbd8604b98a96420.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_off00009565.bin
a9e81c1208f2dd70f19244560ab3aa9cd7604f06b4cc6a805f2235b6ffd556c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9565 4996 bytes
font_01_sfnt_off0000a650.bin
5a4f397161499a7e67601363303f622cc1f0001b2a52833bc6e4370045280f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA650 10756 bytes

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