Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a37c6bd2f7bd69c…

MALICIOUS

PDF

50.9 KB Created: 2020-08-09 18:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12045dc5afd03aa11aa3972f36f8c67 SHA-1: d1882f0f6dbb67aba5e14108043717075f29c003 SHA-256: 0a37c6bd2f7bd69c79049562c8a2da6f7524ef6a6caca35cc30f6e7dbb2a97a8
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=chromophores+and+auxochromes+pdf`. Additionally, another critical heuristic indicates a PDF link farm with numerous external PDF links, suggesting an attempt to distribute or obscure malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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/pify?keyword=chromophores+and+auxochromes+pdf
    • http://files.homefuneralpracticum.ca/uploads/1/3/0/7/130775856/noditojuzonuke.pdf
    • http://puludef.shaynesimmons.com/uploads/1/3/0/7/130775403/rumotum_xozozapobepami_kazeduboxipo.pdf
    • http://files.cjbfriends.org/uploads/1/3/1/1/131163718/3158994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/selenium_webdriver_tutorial_java_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/rujuvirivekatojogupat.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/72745907624.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/zedodovilobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/3504649393.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/pestle_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/kigizujus.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/52033789120.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/gogogofuwelabupegejixaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/38404041589.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077bf.bin
a672b038fef3d35ef05b9ab6acc699f05d79de726f580a983f6fc0abbdf2941b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BF 5208 bytes
font_01_sfnt_off00008942.bin
5592d479c04237c3f3ad61796bfce883d778dd1cafaf69d9c75edef91e397011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8942 11780 bytes
font_02_sfnt_off0000b050.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB050 4324 bytes

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