Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae6a11143d561a…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 06:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d22ca2b60b0777dd541b44e549b3ef3 SHA-1: e87e1ddd99776eab4189e1e908e63be02e3ef5f5 SHA-256: 81ae6a11143d561a54c83f2ae5b1da39854008a9ea601c223bba51c9b852ce71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates this is likely a link farm designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, includes a URL that is also present in the embedded links.

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=tratamiento+para+amenaza+de+parto+pretermino+pdf
    • http://mojegafa.masjidrasoolallah.org/uploads/1/3/0/9/130969176/bekevomozajalex.pdf
    • http://files.thehealingplacecg.com/uploads/1/3/0/8/130874324/1593259.pdf
    • http://files.heartfelthandsbirthservices.com/uploads/1/3/1/8/131871874/238722.pdf
    • http://files.arttherapyderby.com/uploads/1/3/0/7/130739112/0b714ca6.pdf
    • http://kiramug.ememathshub.org/uploads/1/3/1/4/131438392/jabulidoxepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/install_maven_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/paul_wall_girls.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/3823077216.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/kotovurabumemujefope.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/xorasafinim.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/55623950107.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/93547058450.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/19404649989.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/vuwopaloviputug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.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_off00006f0f.bin
07b13108c4967fc627e874c3de2f28cdfa32f5d2653ae583213f3ce60df3e12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0F 4976 bytes
font_01_sfnt_off00007fee.bin
b1f7a5bb4249f20e6684f17a295d80e33188c8b95ef29bf94cc4ca33cc67a41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 10896 bytes

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