Malicious PDF — malware analysis report

Static analysis result for SHA-256 d035a2e1847f7d47…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 03:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed5b270c7a213d57f8b71a20ce40119c SHA-1: fea54698a4bac86f07e0e064a6080934a92337ab SHA-256: d035a2e1847f7d478baaa2dfa59c27cd5d6b6a75953faf62d63f53e39a7dc782
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the target URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirection. The ML classifier also strongly indicated maliciousness.

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=charles+baudelaire+l+albatros+pdf
    • http://files.bttau.com/uploads/1/3/1/6/131606094/4e5f8b0f4.pdf
    • http://files.projectgust.org/uploads/1/3/1/8/131871484/6851200.pdf
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdf
    • https://cdn.shopify.com/s/files/1/0434/0600/0282/files/tratamiento_cetoacidosis_diabetica_ada.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/adverbios_de_grado_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/kevuwipozolelifozoragawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/volanabuwisenamuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/lovonoxikigokuwekifo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/13696982684.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/wegategaxixebunuvajafub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3945/6423/files/486509377.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/digital_ammeter_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/sri_rudram_namakam_chamakam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/10431403654.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_off00006a3d.bin
ee1f153496d31dd69ed7f5bef1e2a437bd5f7a4e1782d7b077b65075138eca56
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 5176 bytes
font_01_sfnt_off00007bc0.bin
f7ad9fa2abed39e53d6409e194f1232d2dd7883004dd7aa1ac9409e0ab010638
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 9992 bytes