Malicious PDF — malware analysis report

Static analysis result for SHA-256 e665d71b68ac7c9c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-13 03:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62974cac4e3a5ef13852073ddc9bec0 SHA-1: 8ac836925e1525677fc45ef855edb78c2433d45e SHA-256: e665d71b68ac7c9caa6499262c9372c4ae46d6de46e1b2d0994da82b3d0fd3cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including one pointing to `ttraff.ru`, suggests a phishing or redirection attempt to a malicious site. The document body, though heavily obfuscated, contains the same redirector URL and references to 'teddy bear coloring worksheet', likely a lure.

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.ru/wb?keyword=teddy%20bear%20coloring%20worksheet
    • http://files.freddyzhaulingmoving.com/uploads/1/3/0/8/130814636/7288390.pdf
    • http://files.westcricketfestivals.com/uploads/1/3/1/3/131379946/77af6.pdf
    • http://jirafu.moliereexpressions.com/uploads/1/3/1/4/131437252/zaviwaw-letodunu-lixaxawunilebiv-zobuxajobuwemu.pdf
    • http://files.ogormemphis.org/uploads/1/3/1/3/131381374/770b2a7eadd9.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/kojepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/fotirizisejimuwubenit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/bible_book_of_job.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/pibuwirezinakesuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/senebuzuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/pigifurosemotevabuzar.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0285/files/90039211892.pdf
    • https://cdn.shopify.com/s/files/1/0436/1660/0227/files/8950641553.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/31410283250.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/toefl_paper_based_test_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/77419657681.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/nevakogogigotevaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/1124/2144/files/94584317369.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fdf.bin
d89a4c2764331c671fcc10a47cc21b4fef91ef021434a216020b1ebeaa3922a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 5548 bytes
font_01_sfnt_off000082cb.bin
a120fd9558a4e16fbbde5008c1e9a95a6c6dd667392bad8abceb76f215968025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 10076 bytes

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