Malicious PDF — malware analysis report

Static analysis result for SHA-256 99350915404c6ce9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-20 00:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f48edf035a6a737e3335c9ca76bb4ded SHA-1: 1895ee256dd4bd27d86da0ad72d94e64386e51b8 SHA-256: 99350915404c6ce9cd7f31bddfeaddab2c2fb5018de49e21a372a47c020a24f0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Polar animal worksheets for preschoolers' and the malicious URL. This suggests a social engineering tactic to trick users into visiting a potentially harmful website.

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=polar+animal+worksheets+for+preschoolers
    • http://files.innovationneighborhoodphl.com/uploads/1/3/1/4/131453022/musokexo_nepugilaguponu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/1356799081.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/pixusofex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/xepokogamorodututoso.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/rukunupurusariz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0436/6175/4518/files/que_es_el_contexto_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/cristianismo_puro_e_simples.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/applied_subsurface_geological_mapping_with_structural_methods_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/zadaxiwivabuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/tininegefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/fevupudepifoxar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9073/files/65567012513.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/41410808115.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_off000061af.bin
5acaaad5b45ceb968d9719f5ebd13a15061a51616673af8fdf9f3b48a710fe68
pdf-font-stream PDF embedded font (sfnt) at offset 0x61AF 5412 bytes
font_01_sfnt_off000073fb.bin
b06daa4076586706d13b0fbdd5f912f5c1f7367464af13f6da69541629550b87
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 9872 bytes