Malicious PDF — malware analysis report

Static analysis result for SHA-256 618530db78d98474…

MALICIOUS

PDF

42.1 KB Created: 2020-07-12 08:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b9ad715245c677bc644333867648aa0 SHA-1: 7dfc3c0ba2ecf623e483c7b67d65c793d280791d SHA-256: 618530db78d98474fabf1ef7aa671fcd6d61aa4c6c06f8f29cf367db1f0d8236
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a "concrete design handbook pdf". The document also contains a large number of links to external PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent.

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/wb?keyword=concrete%20design%20handbook%20pdf
    • http://files.sgsign.com/uploads/1/3/0/7/130740018/630566.pdf
    • http://files.wheelsoftimeinc.com/uploads/1/3/1/4/131453249/tubevaj-diwiwawas.pdf
    • http://files.christianmemoirs.com/uploads/1/3/0/7/130739740/riraxom_rodugarafo_kepinezoz_texemivikutuliw.pdf
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/77981458166.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/738460863.pdf
    • https://xusogoresob.files.wordpress.com/2020/06/22826499175.pdf
    • https://jitazip.files.wordpress.com/2020/07/xojetit.pdf
    • https://nobusajufuta.files.wordpress.com/2020/07/94429244135.pdf
    • https://famunuguraj492377956.files.wordpress.com/2020/07/61619055123.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/33753074398.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/71932352459.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/12100801842.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/54150461009.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/xawubapiguzoravawo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/43973938796.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/fidafo.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_off00006483.bin
b1a045bafc6e6602c4484d1e61abe110733abd34cb2a69c300440f5fc13220dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5400 bytes
font_01_sfnt_off000076d1.bin
f84ef8c3e19e3afb3dbda819027a8d16d830148933042fc655d399a99a9ccad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 10804 bytes

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