Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c18ae9c216ccee2…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 18:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf59e4fb7d4163486d0df6f923a5fd8 SHA-1: 7148399ca10a380d11c1a99cd05db175056b21ab SHA-256: 5c18ae9c216ccee2b1d51acd4780fcb408e42ac3dcea14b09b8c4648d363fbf2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/pify?keyword=hino+owners+manual+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Hino owners manual pdf' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=hino+owners+manual+pdf
    • http://files.maisyandlolarentals.com/uploads/1/3/1/4/131406427/bf105921e0215.pdf
    • http://mukibas.idffafoundation.org/uploads/1/3/2/8/132814930/1161134.pdf
    • http://wazasum.outsidethebox.nz/uploads/1/3/2/3/132302780/aef506c0.pdf
    • http://files.halloweencity.com/uploads/1/3/1/4/131437246/594dd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/biochemistry_of_carbohydrates.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/piwelesopuris.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/wusixaravedivuzaxoze.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/ejercicios_de_movimiento_rectilineo_uniforme_retardado_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/mcdougal_littell_algebra_2_resource_book_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/public_finance_economics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/any_to_dwg_converter_online_without_email.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/36070571751.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0151/files/88857820630.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/redirecionamento_de_site_html.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/riwovikoxoxipuragevujo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/28209798595.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000619f.bin
e9acfe2accce79c4ac9ce8c979ebec6dca3eb6498dd9ce6a285efd69b7d2e1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619F 5240 bytes
font_01_sfnt_off00007368.bin
b3251f60434f3e1975ead4f97c6944a1fcaf86199cdc473594e1e5d7db85bca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 10168 bytes

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