Malicious PDF — malware analysis report

Static analysis result for SHA-256 100e4ab8c2b2a531…

MALICIOUS

PDF

40.5 KB Created: 2020-10-01 14:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3bd6634aa2d423125dc5c60d17fcae4 SHA-1: a9c27d8004014fd64cb148ad168154278cbd6a20 SHA-256: 100e4ab8c2b2a5319f8006d8a601baa0d2e82fbbf07f64bb52ed3efa2e0fc25d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a link farm or SEO poisoning attack, aiming to lure users to malicious sites. No scripts were extracted, but the presence of numerous links points towards a phishing or redirection attempt.

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://ggtraff.ru/strik?keyword=anansi+and+the+moss+covered+rock+pdf In PDF document text
    • https://site-1037840.mozfiles.com/files/1037840/zokojezelowemi.pdfIn PDF document text
    • https://site-1039390.mozfiles.com/files/1039390/10724317851.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/jujerepunodumumigenazupi.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/kuwatonegekirisatet.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/moxabopezapedugezeta.pdfIn PDF document text
    • http://files.locavore-market.com/uploads/1/3/2/3/132302916/c427eb23.pdfIn PDF document text
    • http://vewuva.serenefoxgames.com/uploads/1/3/1/4/131406861/xuwikojilubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0045/3541/files/navodaya_admission_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2654/4802/files/20326463652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/jaquar_sanitaryware_price_list_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/tiroxonexik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/44756037534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6033e6-91ee-4b31-b0bf-ecd5a4a706ec/22470989669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcf0ca6-647c-4ef8-a391-ae1ffff0f6b3/51120731590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5188f3bf-ddbd-44a2-bdbc-2dc9b98459cc/97740847634.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F49 5476 bytes
SHA-256: 3775ebed5f3ef0d1505d6db5a81b1adabdd3bfd6599533c14990fe7d6052a38a
font_01_sfnt_off000071c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 10324 bytes
SHA-256: d06d6b44c3bd6ceda0660556cb92b3ac608ec1bb764e1cda2e3b4e2f07445298

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