Malicious PDF — malware analysis report

Static analysis result for SHA-256 41788fe48844c234…

MALICIOUS

PDF

51.1 KB Created: 2020-07-24 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb33ed393164b1914073576745bbb8ae SHA-1: c8cece47f81cc71abe055ab7601fe0d405bc41a6 SHA-256: 41788fe48844c23450aca5f6a5d37da9ec6d66c8e74e8562a45dfcaf626ef5b5
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Google local guide levels benefits', likely a lure to encourage clicks.

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=google+local+guide+levels+benefits
    • http://files.novalumberjacks.com/uploads/1/3/0/7/130775107/wawitumojolup.pdf
    • http://files.pvcmarblesheet.net/uploads/1/3/0/7/130775665/9578512.pdf
    • http://files.fulcrumboat.com/uploads/1/3/1/4/131412858/036c8c8100e33bf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/vovakokevajupejilub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/pinebofobu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/65394639101.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/45923979747.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/rofiku.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/regatukubosodetefagabijeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/51046277658.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/3449825265.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0709/files/20868728269.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/55170610978.pdf
    • https://cdn.shopify.com/s/files/1/0431/0541/9418/files/32856556278.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0431/2458/8701/files/30726442188.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/kevalavoferalufixe.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_off000083df.bin
c87a2df4b5a612cb389cb1ce606d3393d1200b49378646c2e1018beb906fd963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DF 5208 bytes
font_01_sfnt_off000095b3.bin
2025d19fbd2b453fc293dadfe3720e77b3e9fed61ddcf0175e1aacbe6fe68133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B3 14424 bytes

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