Malicious PDF — malware analysis report

Static analysis result for SHA-256 38755d1fe3fb7e74…

MALICIOUS

PDF

69.8 KB Created: 2020-08-09 13:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e2f34f3a8194fd90f8d5bba26676d4a SHA-1: dbd8550f5de291125c13566a9c4d9cb688564b06 SHA-256: 38755d1fe3fb7e746c7be7be5a239ec3a9f5fdd03d8247041935bf1d914afd76
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects through ttraff.cc. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=integrated+biomaterials+science+pdf', indicating a lure to download or view a file. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirms the malicious nature of the links.

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/pify?keyword=integrated+biomaterials+science+pdf
    • http://files.fallcityarts.com/uploads/1/3/1/6/131606271/narebenugipimirev.pdf
    • http://files.wirralcommunityorchestra.co.uk/uploads/1/3/0/7/130776295/7066531.pdf
    • http://files.lilypadnotes.com/uploads/1/3/1/4/131406811/kafiso.pdf
    • http://files.brittbuirs.com/uploads/1/3/2/6/132680808/bilev-zivorisu-fitige-towup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/dikemiviz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/solubilities_of_inorganic_and_organic_compounds_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/37027260130.pdf
    • https://cdn.shopify.com/s/files/1/0438/3634/2434/files/minatekubafoxe.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/local_anesthesia_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/toxasanovo.pdf
    • https://cdn.shopify.com/s/files/1/0445/9390/5828/files/pdf_amdal_perusahaan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/zalos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/1178267011.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/georgia_form_g_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/24051526221.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/lizamosebusowobudejezujup.pdf
    • https://cdn.shopify.com/s/files/1/0445/1778/5759/files/math_words.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_off0000d143.bin
bc9b36b5a696c7d860df4df97471ed6b4a43280fd49ff6391b6cfe7dc7649f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 5552 bytes
font_01_sfnt_off0000e40c.bin
203f1427929103931fa932545aa122fcb30836d9a574ecd29e2fe894b69d1101		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 11044 bytes

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