Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eabdf3121a87c3…

MALICIOUS

PDF

57.5 KB Created: 2020-08-01 21:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b795ede1c448c33ae9bae6d36b1a10dd SHA-1: 898f1cc88e0c7353e208b59be75a7399cadf2b16 SHA-256: 81eabdf3121a87c38b78552ee60ff28998d8d385f242afeab27b74a63279ce0e
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector leading to 'https://ttraff.com/pify?keyword=show+box+apk'. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support the malicious nature of this document. The document's content appears to be a lure for a 'show box apk', suggesting a phishing or malware distribution attempt.

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=show+box+apk
    • http://files.prettysbeauty.com/uploads/1/3/1/4/131483265/87f687.pdf
    • http://files.cityofbloomfield.info/uploads/1/3/1/3/131379183/5718a0d561f8e.pdf
    • http://files.henrycovey.com/uploads/1/3/1/1/131163540/dikugerowike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/19701116645.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/56593024360.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golizikedakumeru.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/78036458028.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/zibomokotokelobibarirona.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/24491517504.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/65741837367.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/19598503283.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/madoratir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.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_off0000a4c9.bin
ef017a3ecc30d56f9fd78c95f2890384e7060ef4758e529c3f0d8e6ec5a08ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C9 5068 bytes
font_01_sfnt_off0000b61b.bin
c17769507eb27a9f0de8aaf43e3b161439482890d5db87b1f85604667bc93e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB61B 10556 bytes

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