Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b75ded9ba89e49…

MALICIOUS

PDF

118.2 KB Created: 2020-08-10 18:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9872acf8b3d266168bf0a74e3f83ad3 SHA-1: e630e46652b855b00f266ec65f55e1a2847f1d4f SHA-256: e9b75ded9ba89e4952d4f231477e68b0650280d23eb77eb38bd4019cfa71148e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=aprendizajes+clave+secundaria+pdf+matematicas'. This URL is embedded within the document body, disguised as a search query for educational materials. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=aprendizajes+clave+secundaria+pdf+matematicas
    • http://files.weatherdragons.org/uploads/1/3/1/8/131857465/vojukasatekeg.pdf
    • http://files.creatingthyme.com/uploads/1/3/0/7/130739898/mulot_zuxolivozotub_zulutudi_xakenopini.pdf
    • http://ruwimox.precisionskitune.com/uploads/1/3/1/4/131437402/8051219.pdf
    • http://files.hhsflexiblelearning.com/uploads/1/3/2/6/132695531/e01e9b5d8205e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/deadmau5_4x4_12.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/fopexanijonoxobisil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/wiseximipinefako.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/22847486159.pdf
    • https://cdn.shopify.com/s/files/1/0436/9081/9739/files/mazexugumefaridir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/origami_dragon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/ranigagovamamopilusuti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7129/1035/files/barrera_hematoencefalica_histologia.pdf
    • https://cdn.shopify.com/s/files/1/0435/9595/6386/files/65944674800.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/xixijufarus.pdf
    • https://cdn.shopify.com/s/files/1/0440/6312/9765/files/babowawalag.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/63563746561.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_off00018dbc.bin
0f272a1e8c601fe6702332e8087978100f80ac559c4cc15d990eeeacc0d051ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBC 5476 bytes
font_01_sfnt_off0001a052.bin
2c2de98afcca33a2dc9cf0ee2187423a0608487f06ab4675233ac0284dae4d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A052 12564 bytes

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