Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fc1f85ab386c8b…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 16:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0fd767ea7f5bceb4502afc7ecfa05fc SHA-1: ea34faad3f5dd3d60f6453bc8fce8ad90701164c SHA-256: c1fc1f85ab386c8b777a8d9685e40d7e5059cf631bb31e3a5eadcbc525fd91c9
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of an SEO link farm, with numerous embedded links pointing to various PDF files, many hosted on cdn.shopify.com. The primary malicious URL is https://ttraff.ru/wix?keyword=... which suggests a redirection or phishing attempt. The document body itself is heavily obfuscated and appears to contain the malicious URL embedded within it.

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=%25D0%25B3%25D0%25B4%25D0%25B7+%25D0%25BF%25D0%25BE+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25BC%25D0%25B5%25D1%2582%25D1%2580%25D0%25B8%25D0%25B8+8+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25B5%25D1%2580%25D1%2588%25D0%25BE%25D0%25B2%25D0%25B0+2016
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/71721961168.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/soweto_gospel_choir_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/penguin_young_readers_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/30789706404.pdf
    • https://cdn.shopify.com/s/files/1/0449/1404/9191/files/pixar_storytelling_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/cattell_16pf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0439/3389/2763/files/vezoxiwujewiroruke.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/40333486445.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/60644989159.pdf
    • https://static.usrfiles.com/ugd/6cf392_db5973aa87694c07a0e4d1491e06427f.pdf
    • https://static.usrfiles.com/ugd/b910ae_deef593c197c409fbf8cfa67ddf725f6.pdf
    • https://cdn.shopify.com/s/files/1/0440/1361/7302/files/principi_di_anatomia_microscopica.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/xoxakojujafalujulabofugun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/92476546300.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/wordlist_for_backtrack_5_r3_free.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/
    • https://cdn.shopify.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059de.bin
0d763abeb30b40ecba83fdf010bd1d3fd71d75efc547139ee88f2a95c66c9a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DE 6392 bytes
font_01_sfnt_off00006f3e.bin
c5bb24a15113bf357629bde37e174f6107e03a581060597aca439c36670f433f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 14812 bytes

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