Malicious PDF — malware analysis report

Static analysis result for SHA-256 682eaac62e0bb204…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 03:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c15c1f68f67d22906273f90622e218d SHA-1: 602c215a715bd00d47b0de7a2c59ce1d9c25cd74 SHA-256: 682eaac62e0bb204d446ece7334a8e3005543614c1818aa8908812cbe7739277
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting it is a 'quiz answers' document, which is a common lure. The primary malicious URL identified is https://ttraff.cc/wix?keyword=captain+cryptic+quiz+answers, which is likely used to redirect the user to further malicious content. The PDF also contains a large number of other links, many pointing to benign Shopify URLs, but the presence of the malicious redirector is the primary concern.

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.cc/wix?keyword=captain+cryptic+quiz+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/oceans_piano_sheet_music_musescore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/chaton_app_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/bsc_1st_year_inorganic_chemistry_book_download.pdf
    • https://static.usrfiles.com/ugd/f0e51d_8481b39db2664192b57af48e6e290eb5.pdf
    • https://static.usrfiles.com/ugd/921909_ed984ef4069d452f93d2b01ea925b89a.pdf
    • https://static.usrfiles.com/ugd/a382ee_7c28cfafa23e4bbaaaf034a009ffba8a.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_4ad0828515d542f39b461aecb115e3ff.pdf
    • https://static.usrfiles.com/ugd/544c7e_5a8a8f15fd164e9ab54214d27f72d720.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/6630371889.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/vafuzupalewise.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/wimewojufafodozez.pdf
    • https://cdn.shopify.com/s/files/1/0452/1161/5392/files/fexupulewajuparel.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1862/files/meleromifasofobijet.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d878a99e694a5d98a201f02f8bfb7a.pdf
    • https://static.usrfiles.com/ugd/8b2c09_ec6648f6cbcd4fbca5b37c85f52a8599.pdf
    • https://static.usrfiles.com/ugd/b8c837_4beb8039afed4e47a032263a46b8e020.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_cfa4fc4c262d45eab06351aad7b96e91.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_off00006d71.bin
390ef671f3fc7c5b0c0772df689f5ba637a62e23cf2f615123785cc4aeb00cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D71 5172 bytes
font_01_sfnt_off00007f3a.bin
bcf7b5762b9dc1e3e4825f27f88f04fe85cdb9b7d2d0d33293a0b1ffc7ee71e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3A 10420 bytes

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