Malicious PDF — malware analysis report

Static analysis result for SHA-256 1621d0fe452e3acd…

MALICIOUS

PDF

44.1 KB Created: 2020-08-06 03:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377fe4400d23d7920aa26210e33c5192 SHA-1: 88f1fc2e82844db8513a29efaae6067bbe170465 SHA-256: 1621d0fe452e3acd03fe27a5d3c0e06bea4ac73178757db56b6ccbb761d37694
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common technique for distributing malicious content. The document body, though heavily obfuscated, contains the primary malicious URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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=before+i+let+go+book+pdf
    • http://files.bridgettempest.com/uploads/1/3/1/6/131606222/9367962d.pdf
    • http://files.isinglassriver.us/uploads/1/3/1/3/131398350/199f0cea.pdf
    • http://files.hogsandairdogs.com/uploads/1/3/1/4/131406507/zikaluguzudijix.pdf
    • http://files.universalmatrixhi.com/uploads/1/3/0/7/130776225/b8c3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2261/3654/files/76546395492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7895/0810/files/lozofixetala.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/22079498042.pdf
    • https://cdn.shopify.com/s/files/1/0433/5534/0954/files/online_to_word_typing_jobs_without_investment.pdf
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/91403893782.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/gavuzusevufibovowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/zagisodegek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/39657724589.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8757/files/52547158425.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/surazazugenazokurulutuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4229/files/bank_preparation_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/lapabig.pdf
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/sujovivilajikesine.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_off00006f63.bin
55b75736ba567310048240b9a2b455c3f91daa697396e2ba2ada9757e0d22636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F63 5076 bytes
font_01_sfnt_off000080be.bin
feb408a3d0e9e258f8481f64ac01815ba7c7bd9e9a98fef40dcc074f2438b75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 10240 bytes

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