Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e513c801664b3d…

MALICIOUS

PDF

34.4 KB Created: 2020-08-05 23:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d91e429476f596dc56e6718d96ac25aa SHA-1: 628c9b670cabf17d25be9e46816302d9fba12d8e SHA-256: 90e513c801664b3db0ad0c6fafee0af9aaabd0f235532983f8f85399831b0a46
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection and link farm.

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=chou+electrocardiography+pdf
    • http://files.silverfoxxjournal.com/uploads/1/3/1/3/131382092/3827191.pdf
    • http://files.hettonart.com/uploads/1/3/0/7/130775645/4814087.pdf
    • http://files.la-enthusiast.com/uploads/1/3/0/7/130740242/9050037.pdf
    • http://files.francescaterberg.com/uploads/1/3/0/9/130968961/jazajegikuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6831/0172/files/xonijekine.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/zezekopavobulavetilumowez.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/building_plan_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0438/1510/8765/files/xabodeguzovedu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/88300082476.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/40262307056.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11147191401.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/39628722857.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/74439957678.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/73123313225.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/bebetamuloxojadigibumiliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/75822909339.pdf
    • https://cdn.shopify.com/s/files/1/0431/5974/8769/files/webewefeses.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/tuzaketodaxotaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9949/files/73432601811.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_off00004a19.bin
591942ccbbe3edb7b5ecc66003febfdb67419ffd77f8fa96d71f11d5a8ed7ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A19 5244 bytes
font_01_sfnt_off00005bf0.bin
dcfb3419efee476165b2d0093d79d3fafb0292582a80d478942e163992191268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF0 9640 bytes

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