Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5e72a35578c256…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 06:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2487864f73513cce719af0c29c830c SHA-1: 869174972d5b9e40bf2d1caf8e9a2f3c6387df0e SHA-256: 1c5e72a35578c256614ad25b1034e6ba3c91e6b4f9adb4b0ba21e4fdd9f51755
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, specifically ttraff.com, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Tactics for toeic speaking and writing tests' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination and improve SEO for malicious content.

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.com/wix?keyword=tactics+for+toeic+speaking+and+writing+tests
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/wajisutibixibududapeditaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/83192323253.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/kudal_cancer_symptoms_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0452/0479/9639/files/fefufovadijewajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/4927116009.pdf
    • https://static.usrfiles.com/ugd/9b33c5_1ab02239c0a7434eb3bf548e16db5ea0.pdf
    • https://static.usrfiles.com/ugd/b8c837_99708c189bd14f61846832929278c864.pdf
    • https://static.usrfiles.com/ugd/9c0842_9ed9c56d8335468e96fa68813267c2b0.pdf
    • https://cdn.shopify.com/s/files/1/0432/6155/8944/files/xesomitusugoxumix.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0033/files/bleach_english_dub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/casio_illuminator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0445/7195/1268/files/69397864141.pdf
    • https://cdn.shopify.com/s/files/1/0437/6274/5501/files/91277013462.pdf
    • https://static.usrfiles.com/ugd/b8c837_955193f177cb47a8b3e45262bbd0bbda.pdf
    • https://static.usrfiles.com/ugd/e2c250_57f395e38cc7473496196bd9d31fb75f.pdf
    • https://static.usrfiles.com/ugd/b8c837_86be33b931344efba0f429b74e7e9e4c.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e7.bin
90cfd17091262286ac9b0435f050cda6dfcfa93b37194754990b762372d4279f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 7548 bytes
font_01_sfnt_off00007ce5.bin
8324e79e6e489c6cca7c1cd7d6091dee1c9f77e2f078f6f72fac1a39f0120a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 5396 bytes
font_02_sfnt_off00008f5b.bin
f0c4f9158fbeeebf30176f9475217a73b68794481dd08d65be31c4ae32008f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5B 10484 bytes

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