Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a1946e2746d4d2…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 01:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def145c2ed7ce776711fe72b3e864c32 SHA-1: 0fc6c91987ee96d57c17a65cb79b87214c9ed407 SHA-256: c9a1946e2746d4d249fe736cf760e708faac7d4803c5664688d8327e87842832
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL to the malicious redirector and several other URLs hosted on Shopify and static.usrfiles.com, which are likely part of a link farm. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious sites.

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/wix?keyword=multipurpose+room+blueprint
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/36481714451.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/amsler_grid_printable.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/boxidasifaninexugadowosox.pdf
    • https://static.usrfiles.com/ugd/d01287_cde9b2bd11a6466da1aa23c4cd8f4e82.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_34b66e056e8b478491431b100d4de086.pdf
    • https://static.usrfiles.com/ugd/b8c837_3242fbb5d0d34c3583bbbcd71ecc4925.pdf
    • https://static.usrfiles.com/ugd/c1de29_c80e762659684bc6b3783a520ed4498e.pdf
    • https://static.usrfiles.com/ugd/a4d998_d9183647e1b3405788cda9bb912c1d91.pdf
    • https://static.usrfiles.com/ugd/1a89c8_de3186b516e144b29bb92e583b9f3eda.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f46307689d54debacfec8c14670a98d.pdf
    • https://static.usrfiles.com/ugd/269bb8_f30431cccc64439db54be21275a36058.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_off00004e45.bin
5ae0ad2e6d5961a35111b285e4fe2968ef5681720eb1fd4c688e63082890ed87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E45 4900 bytes
font_01_sfnt_off00005edc.bin
fdffb6381e5cdb392e8a14dbd627550bb17cde4f0881e53ea82ca3771216afd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 10032 bytes

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