Malicious PDF — malware analysis report

Static analysis result for SHA-256 f390a1b98f23232d…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 18:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f972a769d21a0f48b8990ba1ff05b0 SHA-1: 11569d155484f5401953aba6722ff72b9849ca81 SHA-256: f390a1b98f23232d8f65281e345552571809ef386d48f14de4975b74bea0b720
154 Risk Score

Malware Insights

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

The PDF contains a lure for a 'free boss baby invitation template' and embeds a link to a redirector. The redirector URL, 'https://ttraff.cc/pify?keyword=free+boss+baby+invitation+template', is flagged as malicious. The document also contains a large number of links to external PDFs, many hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness.

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=free+boss+baby+invitation+template
    • https://static.usrfiles.com/ugd/83e24f_bb83faa5cc1b402e92150675edd5ead8.pdf
    • https://static.usrfiles.com/ugd/cd79e3_e61a6c22895e4d09b050ddbd08bf723c.pdf
    • https://static.usrfiles.com/ugd/73c254_e2f2c7fa3c774c9687edb77a8af2d6ac.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/gawaxepufinororedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/60695541518.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/lerowamuferexuliveden.pdf
    • https://cdn.shopify.com/s/files/1/0450/9771/3829/files/add_text_to_a_file_online_free.pdf
    • https://static.usrfiles.com/ugd/136d07_1d658b40e26643bf8a354312d9439e19.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_6e83baf98b8c4d628aa2a22a610d1f0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0afa4b2a84a64e9baa824f45f18a3dfa.pdf
    • https://static.usrfiles.com/ugd/affaa6_c0f9beba86b54086bca4ff8b8f3ee32f.pdf
    • https://static.usrfiles.com/ugd/b8c837_935a8343ec544018a841e5ed105e3f9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_15861b91b164477fb0af47f3fd67a988.pdf
    • https://static.usrfiles.com/ugd/1cc777_87e47f6664f04793adf2f6f17218051b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.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_off00005dc6.bin
6c666fbe771eedb1fb95b1dee0245eb3d6460d37321914421cea9df01a2556fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC6 5220 bytes
font_01_sfnt_off00006f76.bin
9d3171fa16117168eb13cd6b2d8364ae558cbb29c71398d2f9045c51e11fed90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F76 2520 bytes
font_02_sfnt_off00007a2a.bin
03be23e250f8017be6eda1105729da9eda189bb8544c7a6b554a18df9c2fd023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2A 10036 bytes

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