Malicious PDF — malware analysis report

Static analysis result for SHA-256 189417f4bb4dbee9…

MALICIOUS

PDF

34.9 KB Created: 2020-08-25 23:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49575116c8a30c82e8b78a18ad8d5f20 SHA-1: 618bc9423157d48513c583b0e469cd6570365c41 SHA-256: 189417f4bb4dbee9eff3572ba479064b4502d348750da69b378af26d18af38b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The document body appears to be garbled text, but the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

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=%25C3%25A7akallarla+dans+3+s%25C4%25B1f%25C4%25B1r+s%25C4%25B1k%25C4%25B1nt%25C4%25B1+indir+mp4
    • http://luxun.thecrowseyeview.com/uploads/1/3/0/8/130874104/1797616.pdf
    • http://fosumegej.polygonetechnologies.com/uploads/1/3/1/3/131383791/viwupod-zowumukevebib.pdf
    • http://padixex.armcandycollections.com/uploads/1/3/0/7/130775475/suvumoxija-zolutufi-buzubate-filefupujexuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3538/4225/files/manhattan_logic_games.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/caracteristicas_biologicas_del_adulto_joven.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/71210539225.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/4897260053.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/ccrt_scholarship_form_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/mobobuxuxasepevunan.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/fubuzojewomuzorera.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/nagisat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/latitude_and_longitude_earthguide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/pavonemasasexilades.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/bilesogiguzuzidugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/54841372318.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_off00004629.bin
b798a7b2f90b82715485e9dc0b6aa40c0c3d0b7a49050fd56fb80b5c04f35c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4629 5628 bytes
font_01_sfnt_off000058f3.bin
4ff6ccd669fd69532f8a12bb346bfb294723af1d3b67930acecdc2e8fc05a9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 11268 bytes

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