Malicious PDF — malware analysis report

Static analysis result for SHA-256 762cea9ad26ef28a…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 15:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c3086afc40e3aea9bff1f62f82d521 SHA-1: f68bd605eac08f327c93e486bc46193ac3dc8511 SHA-256: 762cea9ad26ef28a02cd2dbefb980a4b12dd5e8e250c70000ebca6e896e06fda
152 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 'https://ttraff.ru/wix?keyword=como+sair+do+modo+demo+em+tablet+ace'. This URL is likely used to redirect users to a malicious site. The document body, though partially corrupted, contains text related to the URL's keyword, suggesting a lure. 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.ru/wix?keyword=como+sair+do+modo+demo+em+tablet+ace
    • https://static.usrfiles.com/ugd/ceb2e8_c77acfc766d04a7184a6b4480c310eb4.pdf
    • https://static.usrfiles.com/ugd/599f1c_85ea4410de4e4c2c9aa28737be910134.pdf
    • https://static.usrfiles.com/ugd/dba42a_65650ed6b3a14342a957a0f041c3f36d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f40be5bc94947249c1abfbd6357f31e.pdf
    • https://static.usrfiles.com/ugd/7dd30d_6dfc4d6bf4874b7f95ba82a7c2c7831e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/wazonawalitaxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/crosswords_with_friends_answers_10_21_19.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/toloxitudosasaginiko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/neoclassicismo_arte.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/56808175113.pdf
    • https://cdn.shopify.com/s/files/1/0461/5834/8451/files/primus_jerry_was_a_race_car_driver.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujufizolotedugogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/doditazixamevonobefevi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2696/1816/files/cure_brain_cancer_foundation_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/singer_simple_2263_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006357.bin
853f87d5b9cf88d6c4cc3e362032504b6ba4a75a0c9abacb0a73a6d092a9480c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6357 4928 bytes
font_01_sfnt_off0000741a.bin
2f1d6232c4299cb3c735f5455429b5cc21906e48eaed0b26936430b0f51335a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 12760 bytes
font_02_sfnt_off00009cdd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDD 4324 bytes

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