Malicious PDF — malware analysis report

Static analysis result for SHA-256 55507d35e391b33c…

MALICIOUS

PDF

49.6 KB Created: 2020-08-30 09:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2917b7b4600815b70fb81596cd535ad7 SHA-1: 7f8c1a002cf16f628e2a5bbc29ab32988fa3f437 SHA-256: 55507d35e391b33cb7601824621b6296da5cc2ebc877cad114c6a410f66c700d
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on shopify.com, likely for SEO manipulation to increase visibility. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link, which is embedded within the document's content.

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/wix?keyword=servlet+objective+type+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/tiwawokikob.pdf
    • https://cdn.shopify.com/s/files/1/0445/3980/5855/files/pifugagizijutowab.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/data_structures_and_algorithms_in_java_goodrich_tamassia.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/clymer_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/1206488860.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/nagexikunonobebaruludu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/editorial_article_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/elementary_statistics_12th_edition_free_download.pdf
    • https://static.usrfiles.com/ugd/12f4eb_ed04733b9d8040148222058d4b8ef98c.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_4469ad2bb5f2475181addfe2ee844118.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/zizatekubosusibivazibur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/mojujubitab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/69617132678.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/18125764360.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/alimentos_transgenicos_mexico.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_off00007633.bin
5edc669a8c9d09ef03194df65d2f496cc49be7bb3cde44b429b472728e8ad0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7633 5764 bytes
font_01_sfnt_off000089f9.bin
e6adff516039da8ff8c40e6e26e810a0ca69768e2a879044e977c66113ad7e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F9 14472 bytes

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