Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173f3c888d74c46…

MALICIOUS

PDF

44.3 KB Created: 2020-07-21 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcc0bfbb3ec054d4141a79e33ba9802 SHA-1: 0f55de7caf8296fdb8eb741a137525980bc6b671 SHA-256: 0173f3c888d74c46cb63f9b2099dc9e7b8e7e7062e8eb588677181050e9f9f43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.ru/wb?keyword=terminologi%20anatomi%20dasar%20pdf, is identified as a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure.

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/wb?keyword=terminologi%20anatomi%20dasar%20pdf
    • http://files.redandgreenschool.org/uploads/1/3/2/8/132814898/gezejojogubujax.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.mpacf.shop/uploads/1/3/0/9/130969754/wefovedopad_sixunil.pdf
    • http://files.inadocument.com/uploads/1/3/2/6/132696128/341013.pdf
    • http://files.kingsvilleroofingcompany.com/uploads/1/3/0/7/130776511/95571f40a9a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/vekis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/69700886403.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://pudaditi.files.wordpress.com/2020/06/mugofevukupinutef.pdf
    • https://wajowobosub.files.wordpress.com/2020/07/kibosuxadipo.pdf
    • https://nenodixivazu.files.wordpress.com/2020/07/72577119052.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/jefamijurefiludom.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/tunubisararalanub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/68685835867.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/78779117170.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faramerujinusopuko.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/18032369369.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/leraxekemikumesub.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/wipekobapemoregudo.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_off000070fe.bin
aff4f21747966dd0ea60f86eeb50f3dfaf4f21500b46a51b0ca82dc60156d354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FE 5096 bytes
font_01_sfnt_off00008231.bin
2b890fc18526d1ce020913c11542c2ae5b4e3d7c68fc338436da334edeef66f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 9920 bytes

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