Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b9d1e263e2f03…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5298647c10898e1d9065308fa86262de SHA-1: 4fdcb5d9dbeb06a8944c4aadf6cd3ca53559d664 SHA-256: 623b9d1e263e2f035745a967e0b4190a67bdce7700ff4418dd95a1ed107f1410
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a direct link to a known malicious redirector, https://ttraff.link/wix?keyword=divisibility+rules+worksheets+for+grade+6, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness.

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=divisibility+rules+worksheets+for+grade+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/8042/5112/files/lazuxipif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/wejewowix.pdf
    • https://cdn.shopify.com/s/files/1/0429/9787/4851/files/comment_afficher_les_formules_sur_excel_2010.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/xosibumodufasalot.pdf
    • https://static.usrfiles.com/ugd/ae059d_1cd004d8092f4b868a6d0e9398acd27a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d413f66ba2754318983edc8952c2a461.pdf
    • https://static.usrfiles.com/ugd/2b25b5_08056d00effa4374af91ce9d8becdede.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/32555134402.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/99868929347.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/38506706470.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/aluminium_6061_properties.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/16752748189.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/repijiganudelineraz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000725a.bin
0b90d7901fb3037a33099791d7b2cec32e33a064302376e164d99986effab257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725A 5780 bytes
font_01_sfnt_off00008625.bin
8a3d84931857a82d242ac54191e285402223384666cd217483df0078494f5eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 10044 bytes
font_02_sfnt_off0000a8a8.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 16060 bytes

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