Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b60e81838d578e…

MALICIOUS

PDF

59.0 KB Created: 2020-08-30 18:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88703cb8039a630d463074dabf59a3d3 SHA-1: 9497b0b35142b3bb7866ff914b8633621b92382b SHA-256: 10b60e81838d578ee20bd468e4c426c6ba3df1de641ebcb6383b6f652eb79067
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.link'. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to other PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.link/wix?keyword=el+criticon+fragmento', is the primary indicator of malicious intent, likely serving as a lure to a malicious site.

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.link/wix?keyword=el+criticon+fragmento
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/88484136688.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/goged.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/muzunobiduluposegeditev.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/addendum_template_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0434/6799/7344/files/bibaletotezis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/kabivadesojisejeguveluteb.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/kojajafi.pdf
    • https://static.usrfiles.com/ugd/b8c837_9690b3e34f7743159963d5027f40e0e5.pdf
    • https://static.usrfiles.com/ugd/cc089a_cfe2b952052f4676a009232975a87f94.pdf
    • https://static.usrfiles.com/ugd/7598fa_7855c311389a43f08e9e874e1e25f7df.pdf
    • https://static.usrfiles.com/ugd/19103d_051b66d1d7414ec59705376b9ded08ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a546c8a136ec40e4bcd47e1fc368ed8f.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_d8a819fd54dd490fbad7c0a1abd05ddd.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_off0000ab78.bin
3eaaf1455d9a6c508dad2f8bc8b1b6f8cd34752c5ba4c047a7d9d59c40b7cd02
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB78 4980 bytes
font_01_sfnt_off0000bc4a.bin
5aa6ed903b551f3ef367e1275f6809e0af2b7804ee85aea34bd7350569fbb752
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 10256 bytes