Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01b8abfaa792818…

MALICIOUS

PDF

48.1 KB Created: 2020-09-02 07:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a4ca8356effa283a9a5e91f549d7729 SHA-1: 4dcbdb185f38fd26d4757763af4100d07d2ca00e SHA-256: f01b8abfaa792818a94cc3c64c7c1f370a2018015a0cb6ef64402b5262f89bdc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, 17 in total, pointing to Shopify-hosted PDF files. One of these links, https://ttraff.ru/pify?keyword=all+information+about+periodic+table, is flagged as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious content, likely for phishing or a scam. The ML classifier also strongly indicated 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.ru/pify?keyword=all+information+about+periodic+table
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/21096226597.pdf
    • https://cdn.shopify.com/s/files/1/0463/1753/5397/files/eine_kleine_nachtmusik_piano_sheet_easy.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/centroids_and_centers_of_gravity.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/capas_que_componen_la_atmosfera.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/bosemeli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9927/5935/files/47246103588.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/the_vintage_book_of_latin_american_stories.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/bigegiroferag.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/getetudiverelevuzisabeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/dawn_by_octavia_butler.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/76071765524.pdf
    • https://static.usrfiles.com/ugd/2ac701_7d3c58f6b92245308f641a63ff8d49ee.pdf
    • https://static.usrfiles.com/ugd/b7ab08_b4c6df10016a49c38050ac816748cfd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c046e6c9db3f4ae79f7e44e1e978235e.pdf
    • https://static.usrfiles.com/ugd/d1c05f_aa2a4059877e47bbabbefb444d6d128b.pdf
    • https://static.usrfiles.com/ugd/b8c837_161157c80ca949628ceda4d1d843ee1f.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_off00007f19.bin
e2138977bfae155419e885841a756f9a9a63173e7cb4acab49a877d47d6026be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F19 5252 bytes
font_01_sfnt_off000090d8.bin
faa1eb8ad145bf1e8f1013a30ecf0abcaf586efe515703aaf041a720ea36e1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 10116 bytes

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