Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b75960a6ed3afb7…

MALICIOUS

PDF

47.9 KB Created: 2020-08-31 08:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d41183958b7033b1e785456abbce561 SHA-1: bfb95096995e56f9473179410ed735d8e20d52a0 SHA-256: 7b75960a6ed3afb7593b58910229d492def39660f36b139a747ecba14d303939
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, likely for SEO manipulation. The document body contains the URL https://ttraff.cc/wix?keyword=trove+crystallized+sun+spark, which is a known malicious redirector, and a link to a Shopify-hosted PDF. The ML classifier also 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.cc/wix?keyword=trove+crystallized+sun+spark
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/upper_urinary_tract_infection_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/lelulalepewina.pdf
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/american_airlines_gate_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/40151407548.pdf
    • https://cdn.shopify.com/s/files/1/0462/5278/5813/files/kolokumojefageko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/wuputo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7212/7125/files/ds2_estus_shards.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/855_717_7778.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/tobavolavud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/beboniw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/90560046029.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8886/files/descargar_cetusplay_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7392/files/15420745053.pdf
    • https://static.usrfiles.com/ugd/738632_d885c2f88de042b28be8ef0ae14a0539.pdf
    • https://static.usrfiles.com/ugd/b8c837_017512ea0d8b4b4b91fecb44656989ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_933b5050f3a841fca1a8337ce0648192.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a0ae271c24819a837d7c986639da6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a644d38499694b9c92782ebd48abfb49.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_off00007410.bin
1049ec8093ca1860097122587829220b3c5b33d3030c48d2dda176727b9a99dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 5292 bytes
font_01_sfnt_off00008633.bin
77b89e463ece341f0455491191a5ba837660225008bf285ad471a8c93d3d6704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 14260 bytes

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