Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d3bab1451ee8fc…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 19:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc04ffafb0e0c3ba755214629544a518 SHA-1: 6d6e73eb1dc09c626a879060743b62e89ed787d8 SHA-256: c2d3bab1451ee8fcb2ab35308692f9d34c2ee84475e58269e3533c6a2032fcb1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'ttraff.cc', a known malicious redirector. The document also contains a large number of embedded links to Shopify-hosted PDFs, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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=psx+emulator+games++pc
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/nelson_grade_12_chemistry_textbook_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/52360590133.pdf
    • https://cdn.shopify.com/s/files/1/0439/1026/7035/files/31637402444.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/7691340565.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/89829099516.pdf
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/charade_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/backup_contacts_to_gmail_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7239/files/92584770477.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/rewupitimanesomitiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/38511413957.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/pufuzoraxowebugigotus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/watch_gangs_of_new_york.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/11929606836.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9847/files/mixed_practice_factoring_trinomials_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/ramix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/98589829191.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/nowojena.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_off0000690e.bin
06a8a23f5b67a0c6311410928fd1ba5f342e089868742b6e38043eb302bcef15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690E 5320 bytes
font_01_sfnt_off00007b1e.bin
0f423947a188c4d3294cf6099904b6c31b423e63bf9b111c1e3a0f15af506b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 10388 bytes

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