Malicious PDF — malware analysis report

Static analysis result for SHA-256 89247d96ce3167d4…

MALICIOUS

PDF

56.0 KB Created: 2020-08-12 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ac02338f9a6ca6baf9d5d052e8c8fe SHA-1: 455e54ec0b8d6bd401cfd7ed7c364666c8e83ad4 SHA-256: 89247d96ce3167d4f73e34eb1b04bcfa4ec32d3c11d4f4205487f05a77ecd7d8
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=verbal+bullying+research+pdf'. Another heuristic identified a large number of external PDF links, many hosted on 'cdn.shopify.com', suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=verbal+bullying+research+pdf
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • http://files.dicastables.com/uploads/1/3/1/8/131857983/poxesarovekakudoze.pdf
    • http://files.thomasmeloro.com/uploads/1/3/0/8/130813738/dapak_xowijuguwigavaz_xuzobutarusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/92189174965.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/redokenitaputejoresex.pdf
    • https://cdn.shopify.com/s/files/1/0438/2140/0226/files/administrateur_base_de_donnes_sql_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1333/files/cat_3406b_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/dufosufuxexuresuzatoxur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/zevuxametiveroserupobo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/zovokovijijogozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/billy_collins_litany.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/22223922311.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_off00009c43.bin
2a751b4aa14572984d321098ea5c976188e3dde12c3552db8a646e3bd29828d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C43 5624 bytes
font_01_sfnt_off0000af58.bin
346bf14d208c9c0d52271e9a94f458e1f498ddf45f812061c6449470dde584f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 10492 bytes

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