Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3a7df5c06ed355…

MALICIOUS

PDF

49.5 KB Created: 2020-08-02 13:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f3ab927088bb3517c321117cdbe9ae SHA-1: 3ab225d2ca93d27db2d58905cf38a56537dac2d2 SHA-256: bd3a7df5c06ed3551e69e60249d074422d43a2abe2ff987fb2a90f627fec1587
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.ru/pify?keyword=toro+snow+master+reviews'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect users to potentially harmful content.

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.ru/pify?keyword=toro+snow+master+reviews
    • http://files.theothertheatrecompany.com/uploads/1/3/2/8/132814071/fopuluxasug-mugejobe-guvazigovegif.pdf
    • http://files.mybutlerandmaid.com/uploads/1/3/0/7/130775291/dotaked.pdf
    • http://files.brianholmphotography.com/uploads/1/3/2/6/132683400/c748cdbb872.pdf
    • http://files.hemlockedgerescue.com/uploads/1/3/2/6/132681579/5b164.pdf
    • http://files.fellowshipmsc.com/uploads/1/3/2/7/132710745/1126032.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/dalikimofuxoluwelusazija.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/50813645820.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/26235185035.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/95958589834.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/17565125376.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/middle_finger_text.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/5369582579.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/saratasu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/torenemulowupijud.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0591/files/mavogalirarezeloje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/26977961833.pdf
    • https://cdn.shopify.com/s/files/1/0434/6832/5029/files/vemitegopimanik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/gafixoxerukewidiwanodur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.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_off0000832a.bin
a9d9341e8df6bd5d29a733c0a4650011a8ce9900b87c43b27ef0954ebe72263c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 4900 bytes
font_01_sfnt_off000093cf.bin
de0cb4d3f2b4dccf4af240fdb004a9b9d5a80b720cf673ef9c5d913e18ded5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93CF 10896 bytes

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