Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c21bb6a5b43de2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-19 01:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35012526a94f1744b0a0438925b3e1d2 SHA-1: c032120af71ad5206aa7eb84404fd10e47cb988c SHA-256: 54c21bb6a5b43de2b2a3ce258e97d754501b0031df654a712c058a30d9dfb5c2
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicating malicious redirector links and a link farm. The document body contains a URL pointing to a redirector, likely part of an SEO spam or phishing campaign. The presence of numerous embedded links, including the primary malicious redirector, suggests the document's purpose is to lure users to external, 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.com/pify?keyword=cnc+machine+mdi+full+form
    • http://files.dragonshoardllc.com/uploads/1/3/0/9/130969663/3280828.pdf
    • http://files.jodychapel.com/uploads/1/3/0/8/130814408/98f60ac.pdf
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdf
    • http://woweva.uhurugirlsacademy.org/uploads/1/3/0/8/130874330/5871565.pdf
    • http://files.soulhealingcollegeparklanham.com/uploads/1/3/1/3/131379761/tekagegujemuwenika.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/leril.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/pinabagodikiwifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/xibegexola.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/tutidodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6001/8852/files/dangling_and_misplaced_modifiers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/moses_basket_crib_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/42266466492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/xorazunamed.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/50811723865.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4661/files/86639072094.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068dd.bin
1bceb18d6a0f0d2b75e07d661aed64a52dccdbfd26d9faafb40ee3454459fa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 4908 bytes
font_01_sfnt_off00007949.bin
2858ae45591554a732ea8065ca55dcd99588262d78af2882d5cfa3e64dca83c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7949 10068 bytes
font_02_sfnt_off00009bcc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCC 4324 bytes

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