Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cab21188c2f2ffb…

MALICIOUS

PDF

58.9 KB Created: 2020-08-29 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80f0689eef0de3c622ccffcc4bb3aac9 SHA-1: 2031db6b239f1e7f99153d00a5a7951a59835811 SHA-256: 6cab21188c2f2ffbd8ea9aeb1ea0af4e85079b3179f57a8fb18b7239d23f797f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=teorema+de+pitagoras+ejercicios+resueltos, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain a mix of text and URLs, including the malicious redirector and a benign Shopify URL. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to disguise the malicious intent. No scripts were extracted, but the overall structure and malicious link indicate a phishing or redirection attempt.

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=teorema+de+pitagoras+ejercicios+resueltos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/77090758347.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4485/files/77119273241.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/receptor_agonista_y_antagonista.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/91815053358.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/gegabukekekimimunibepa.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/gejakutabujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/bostitch_air_staple_gun_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7283/files/broderie_diamant_grand_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7291/3557/files/algorithm_and_flowchart_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/best_free_movies_sites_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/acog_preeclampsia_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/lilly_singh_bawse_book.pdf
    • https://cdn.shopify.com/s/files/1/0450/5387/0232/files/napoleon_bonaparte_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_c16e7e82a8a5471ca89954a7bc6e9b93.pdf
    • https://static.usrfiles.com/ugd/15cd4d_f01b1eca5a054bc59fc3cdbcb8612d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1340f1607743f594209bed08f197e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f869c9e6f1204f20bb41cb2ded25ac0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1e6880f2654da2884085ebdeb17af9.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_off000084fc.bin
41362a1a1f2f44640f7c0b7d82ffbcfc7069043b53eab07ed8f33387d428a730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 5420 bytes
font_01_sfnt_off00009754.bin
a14e1ce876655badb3f0ffd3280e34ba122e0be2e5334fc5822c1466279f5400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9754 15420 bytes
font_02_sfnt_off0000c6d6.bin
51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16088 bytes

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