Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dd9c551f138554…

MALICIOUS

PDF

37.7 KB Created: 2020-08-11 21:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd650cf77fdcbd449f4a603c40fe438 SHA-1: 38256fee482ace34f80b79cb445a94f4729ec6ba SHA-256: 82dd9c551f138554fc80158a91b70526177a2b9557df855f226ba284933f3201
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, indicating an attempt to lead the user to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content or to obscure the true destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=errorless+biology+pdf+download
    • http://files.barbechamblissauthor.com/uploads/1/3/2/6/132681690/fobonepezevutumem.pdf
    • http://samogut.rsu14music.com/uploads/1/3/1/8/131856584/sutofizanagarajubivu.pdf
    • http://files.cvnworkplacesolutions.com/uploads/1/3/0/9/130969211/2640333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/1285/2632/files/bilstein_shock_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/18374105286.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/93731017322.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/pagugasesoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/mapokud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2961/files/robinhood_api_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/98520651261.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/biwogisojumosasixixum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/xewapixuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/molosukotulenamozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/19141758199.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/99181323895.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/7817913746.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/tobelam.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_off00005021.bin
3fc1f60de937aad601d9caf6b61a1e6c9cdffbdb4fe85f591a50330446911c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5021 5500 bytes
font_01_sfnt_off000062f6.bin
e7e89d27a75099187df4f983705ccc9ede7f5d0f83e3157078477273485209eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 12064 bytes

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