Malicious PDF — malware analysis report

Static analysis result for SHA-256 889d4c3244bdb4fd…

MALICIOUS

PDF

46.2 KB Created: 2020-09-04 15:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d45e32e3b6a33c34c277e368279a4d SHA-1: 9e1479653fe8c22fdad8bcd77a739f6e8e8d2537 SHA-256: 889d4c3244bdb4fd33cf23c68e08f1d668de4a826aff9515b1faa567e960ebb9
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=samsung+s5+voice+recorder+apk'. This indicates a social engineering attempt to trick the user into clicking the link. The document body, though heavily obfuscated, also contains this URL and other links hosted on static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=samsung+s5+voice+recorder+apk
    • https://static.usrfiles.com/ugd/d2cc1f_d66a9fd340034f4eb9e78af21dd17b8c.pdf
    • https://static.usrfiles.com/ugd/47b1e8_2b6166b901df426fb2e35ee46b31e440.pdf
    • https://static.usrfiles.com/ugd/65b209_0ebcfbb94d5a4401a1f71af41cabfd6f.pdf
    • https://static.usrfiles.com/ugd/6846fe_4ddf482a062b4282896e8c48b42da2d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b4c1f4e04f04d0da469195ffab11cca.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_b3b9ad3918544aaf8c3bf98f9e192d5e.pdf
    • https://static.usrfiles.com/ugd/c068f8_23d54af55b614296a7fdc8773ed70745.pdf
    • https://static.usrfiles.com/ugd/097bd5_8ef309b8020a4fe88def144b4767950e.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_300b0e9e24d6413fbedfc2b436ef5c17.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/supijewiferek.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/23249938131.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/breckenridge_weather_15_day_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6662/files/aspects_of_political_development.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f48.bin
46ed0fb1b07c987e8e9e3e15a439dde9df10c041c3f4e36dd49b8ba218fe3383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F48 5512 bytes
font_01_sfnt_off000061e2.bin
5c08aff670cec4c773c7e5b41f6f6ed313dcb40ba8f488e988262fad4bae5ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 13856 bytes
font_02_sfnt_off000088bf.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BF 16092 bytes
font_03_sfnt_off00009d86.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D86 4324 bytes

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