Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe589be55adb771…

MALICIOUS

PDF

44.8 KB Created: 2020-08-13 00:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10e6d1523b28ba0fd79cc35d93e25ef SHA-1: 6cb944b40a6d6acedd943f0c50e34f8859f836ec SHA-256: 6fe589be55adb7715f736986686cc3684aca09d59a34bfc1ce5fdc116849e3bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. The primary malicious URL, https://ttraff.cc/wb?keyword=printable%20worksheets%20for%20grade%203%20english, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'printable worksheets for grade 3 english', suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=printable%20worksheets%20for%20grade%203%20english
    • http://files.solightpro.com/uploads/1/3/1/0/131071037/ferikegazova.pdf
    • http://files.callahans.blog/uploads/1/3/1/1/131164112/bizevinurufi-zeviminewofe-soborudakelu-zoliga.pdf
    • http://files.elsvandeweyer.com/uploads/1/3/2/7/132741322/kuvuvevuk-wefel-digaforogemex.pdf
    • http://files.casewatson.com/uploads/1/3/1/4/131437087/potiv_gujimutipata_medexi_gaferaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/17158658678.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/cancellation_of_insurance_policy_letter.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/34740280596.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/romugofigajilefezalokov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/45784791585.pdf
    • https://cdn.shopify.com/s/files/1/0454/5989/8518/files/74452705283.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/basic_english_usage_swan.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/84945893961.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/93734188599.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/82341558734.pdf
    • https://cdn.shopify.com/s/files/1/0438/3506/4477/files/65319404917.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/bakewavuxox.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/9510499537.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/87926768035.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_off00006f9b.bin
81be774747f24bff70dddc7f8cc2e24670dd1dd99d91dc290adf2ee9e8a56763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 5632 bytes
font_01_sfnt_off000082c0.bin
5b15d31b693e043388d80409d720193895077d3b5aa736af9d8b29ecf77693d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C0 10288 bytes

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