Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a1b8957fe56a08…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 15:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ac533cc4fd1a7dcc059714553099e9d SHA-1: 97c0b78f1c304de8dd5394a6048ae796a67b2ab6 SHA-256: 00a1b8957fe56a08f0659710b663b370620eae2b314d03cac602eb7ce9873ef7
162 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to known malicious infrastructure, specifically a URL with a keyword suggesting a software download lure. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's a redirector link and part of a link farm. The presence of a visual download button further supports a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=java+runtime+environment+7+update+80
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6758/0317/files/aapse_milkar_acha_laga_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/jomasuxoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/79758608901.pdf
    • https://cdn.shopify.com/s/files/1/0431/7478/9281/files/juegos_de_patines.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7450/files/shaak_ti_death.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/8267641509.pdf
    • https://static.usrfiles.com/ugd/3b47cb_a2600982a63346659d38b5365455a84e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d364dab46e24a209039d58dd30071b8.pdf
    • https://static.usrfiles.com/ugd/ef7b09_853470fce73941589bfba00161b2ef32.pdf
    • https://static.usrfiles.com/ugd/dc98cc_1f015dc9303049b38637d308f759ece4.pdf
    • https://static.usrfiles.com/ugd/ac72e0_dd78d6ecd1da41a18105dde6d2564794.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c4124c12b6e44ecb468ccb43e47b410.pdf
    • https://static.usrfiles.com/ugd/234f58_32736cf3b66b42629e58191c1ebf05cf.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_28264cd6864244d89aa3a5094e9eae13.pdf
    • https://static.usrfiles.com/ugd/b8c837_e17292eb6db1468bb6f5aa040c921649.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f2.bin
200da3e42208044d01202e8ef70b9483b7826044390556405fa226a496949b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 5244 bytes
font_01_sfnt_off00007bb2.bin
259dbde3a278e113f1cabc5cce4dd5539889b0c9e6033b9af95eabf20f764394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB2 10912 bytes
font_02_sfnt_off0000a092.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA092 4324 bytes

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