Malicious PDF — malware analysis report

Static analysis result for SHA-256 5defd1e6adbe315e…

MALICIOUS

PDF

47.6 KB Created: 2020-08-08 18:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a5dc1b7ca0cd19845fe3e69acb4de2 SHA-1: 7432d44023839ae19b470a959686fd56e28e9719 SHA-256: 5defd1e6adbe315ebf0b7072ffd38c6754869b697d6a2ab6eccce4f255b8e826
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 a redirector service (ttraff.ru). This indicates the document is likely part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution 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.ru/pify?keyword=cours+anatomie+du+coeur+pdf
    • http://files.heartridgeministries.com/uploads/1/3/1/4/131407357/1746300.pdf
    • http://files.yorkscribes.co.uk/uploads/1/3/1/4/131453111/fatugu_woseve_rejenulafiwa.pdf
    • http://rasugaj.justartkennels.com/uploads/1/3/0/7/130738524/lusulinojikol-pawinu-wezibefom-wuxafelato.pdf
    • http://files.placesbeyondwords.com/uploads/1/3/0/9/130969656/fa26b604010879.pdf
    • http://gusuvikav.caulfieldpark.com/uploads/1/3/2/7/132712207/melemipemafaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/brother_hl-_2270dw_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0843/2027/files/27388873351.pdf
    • https://cdn.shopify.com/s/files/1/0435/6984/0283/files/87903285019.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/zobatuzizegebuvonisowimu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9216/3227/files/tadesixan.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/glencoe_advanced_mathematical_concepts_precalculus_with_applications_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/66327877782.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/28911139108.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/35151738009.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2196/files/zivujaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/10312077595.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/motijado.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/worezozawep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c20.bin
f8d3aa2ad7b5cc50f25b97c4394b4941640b0400f6cf282d26697f398255a4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C20 5172 bytes
font_01_sfnt_off00007da4.bin
0edc5e2c3ce20f2eb89f8719803c9d7b118a9ed8ea9824be5327cec609282a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA4 11200 bytes
font_02_sfnt_off0000a143.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA143 4324 bytes

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