Malicious PDF — malware analysis report

Static analysis result for SHA-256 402e9dde13e1a501…

MALICIOUS

PDF

42.5 KB Created: 2020-08-21 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ce8faf7b26b838ee601bd7ee74432a SHA-1: 81d6f55b79d715a835ec983a9efdc1ea6120db88 SHA-256: 402e9dde13e1a50137558a4a34b9fcf8832db870456b037a2f22e078ec7ad461
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text suggesting it is a "test answer key" lure, which is then followed by a URL pointing to a redirector. The presence of numerous other PDF links, as noted by PDF_SEO_LINK_FARM, further indicates a malicious intent to distribute content through a link farm. No scripts were extracted from this sample.

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.cc/pify?keyword=unit+1+geometry+basics+test+answer+key
    • http://fufojegiw.gcraudio.com/uploads/1/3/1/3/131383936/5246265.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/micrometer_screw_gauge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/koletunabofogomavovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/72426960427.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6817/files/falciform_ligament_hernia.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/vpn_server_free.pdf
    • https://cdn.shopify.com/s/files/1/0462/2893/0709/files/64836052879.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/cardiac_cycle_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/lunodumofiw.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_off00006624.bin
0983b40fd564165e0812057a435f02bae0b758c1f841862086e20a4a994e663f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5528 bytes
font_01_sfnt_off000078fd.bin
ce8899ea56647fd5595e94876867d7c5a1ee0127b767425fac78aaf2e54bad07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FD 11148 bytes

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