Malicious PDF — malware analysis report

Static analysis result for SHA-256 1934eea3518d824e…

MALICIOUS

PDF

51.4 KB Created: 2020-08-08 00:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdfd16b8a802631b1dca37fc6bcd00f7 SHA-1: 71e984faa0b723cafc5b6cb0680a47c17643882b SHA-256: 1934eea3518d824e73cf3e506b0f3cbbf78290a0acedc70b3f06600057ee4343
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'workplace safety in the operating room for nursing'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector or for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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=riesgos+laborales+en+quirofano+enfermeria+pdf
    • http://files.northmetroweekday.com/uploads/1/3/1/8/131856954/bububawujitigudevup.pdf
    • http://files.worlds50bestsushi.com/uploads/1/3/0/9/130969037/dosewam-titadowe.pdf
    • http://files.yifanmake.com/uploads/1/3/2/6/132681536/wimavudugajiba.pdf
    • http://files.goodshepherdpekin.com/uploads/1/3/1/0/131071253/6183131.pdf
    • http://files.culturallyresponsiveteaching.net/uploads/1/3/1/0/131070674/9b940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0631/files/autosys_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/smash_4_tournament_legal_stages.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/tofiturudakavimape.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/stanley_garage_door_opener_parts.pdf
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/tefawanad.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/tomorrow_lyrics_annie.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/kobigaguxabiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/52758725351.pdf
    • https://cdn.shopify.com/s/files/1/0438/3653/9045/files/82050933773.pdf
    • https://cdn.shopify.com/s/files/1/0440/9055/6568/files/dusikemumomujasuzosevo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9573/4937/files/49531207043.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/58950195836.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_off000086f5.bin
69024eb3608df8f57ddb9ffeb2a34e039e6b7bec8686bdff612d0c0a47a599e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F5 5632 bytes
font_01_sfnt_off000099f9.bin
85f800a8ed135301644310485b0cf1d0737b0b430ffb9e801d7c443a011771d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F9 11180 bytes

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