Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb028761d9f06a8b…

MALICIOUS

PDF

57.9 KB Created: 2020-08-05 18:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d9bcf36c38231521585409523069231 SHA-1: 8cd23374371b099ae571225b5937b07df9bc13e6 SHA-256: eb028761d9f06a8b534fe51ef03e721166e84bd1143611834d06428e488cf68f
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic indicates that PDF links point to known malicious redirector infrastructure, specifically citing 'https://ttraff.ru/pify?keyword=carcinomatosis+peritoneal+pdf'. Another critical heuristic identifies a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nunox.pdf' being the first listed URL. The document body appears to be heavily obfuscated or corrupted, but the presence of these links strongly suggests a redirection-based attack pattern.

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=carcinomatosis+peritoneal+pdf
    • http://files.primitivedreams.ca/uploads/1/3/1/8/131871569/gawibiviga.pdf
    • http://files.annawieczerzak.com/uploads/1/3/1/4/131453401/rirogibiva-xepubope.pdf
    • http://files.alisonletsos.com/uploads/1/3/1/3/131379894/niropoxurujepazukoda.pdf
    • http://files.towardharmonywithnature.org/uploads/1/3/2/7/132710782/tujisulamalerum-latejufirori.pdf
    • http://files.africanswisslacewholesale.com/uploads/1/3/1/1/131164185/nojidubotemimegake.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nunox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/gejefodewewamive.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/online_translator_english_to_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/59851463172.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/nekanovudexusufukirite.pdf
    • https://cdn.shopify.com/s/files/1/0434/8218/5893/files/alimentary_canal_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/lofavajudusafomukeduga.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/givulebuxasibipetoru.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/e_marketing_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0428/7220/9574/files/difajokifaketu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/21619703456.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_off0000a55d.bin
25527eb5609879157277925df1d21242051c73639db6603252a7057fcbfb27aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55D 5208 bytes
font_01_sfnt_off0000b6f7.bin
ceab3a45b304cdce5471270a372ad04cc4a261cbe41b987b1d0df0bddeefd778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 10388 bytes

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