Malicious PDF — malware analysis report

Static analysis result for SHA-256 157082f876ea0944…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 03:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900d73d557d50b8ce1f6a7c8a9cf6e07 SHA-1: 6bbc2e54568db3a32a1c8749e9bafe007c82d504 SHA-256: 157082f876ea09443add439b7be8f7c7e6eaf797b8e35ada9d307d261deea3fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or SEO manipulation tactic to distribute or hide 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.com/wix?keyword=fs17+wood+chipper+mods
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_47b75c2ec8b442cbbc60aa9968ffe8a5.pdf
    • https://static.usrfiles.com/ugd/90c678_7ee573048746421387fa5e13133fce46.pdf
    • https://static.usrfiles.com/ugd/a4d998_89af4ebaf3ac4e29ae6fe047f871c9e2.pdf
    • https://static.usrfiles.com/ugd/c1108c_df323ec5d0364359aa1071fd08b3638d.pdf
    • https://static.usrfiles.com/ugd/b8c837_21d6ff3c49214fa6ac49425e5d180274.pdf
    • https://static.usrfiles.com/ugd/bb13a2_d7ca4e9e5b8a438aa3acf1a16dd99ac0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a245929504a444c6b1b6c2df20d37b56.pdf
    • https://cdn.shopify.com/s/files/1/0447/2363/4330/files/google_adsense_policy.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/pengertian_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/vowupatukutawadizawi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/96586228510.pdf
    • https://static.usrfiles.com/ugd/6a7407_72a1d9a6f27f4a26927e2a4e288b7b0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f87842bb954040feacd7262a1cad6ae1.pdf
    • https://static.usrfiles.com/ugd/5899d5_4a37a4f16a934db5a329e290de3a2113.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dd701a1a1a34f57acba642faf80095b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbb3145d13284905af969e02905472bd.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000471c.bin
36d74ceea13a919e17dc72466c40fb766cbe7a70eb6e7807cd4909eee3588ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471C 5252 bytes
font_01_sfnt_off000058f8.bin
c12a5d4e02f787cae7966d90eda5d9fd1ad8d4da8cd757c6834153948f73d036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F8 10248 bytes

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