Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14d30010caf5e4b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-11 09:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1521ecef59f5286a112e60a401cb6724 SHA-1: bb84a419cac3bdfa17b0d03a1f4dc62aa7aa9460 SHA-256: c14d30010caf5e4b78008278591d96600a3ef2d49ee0bed24ebb65134a7f6a60
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though partially corrupted, suggests it is presented as a worksheet, likely to trick users into clicking the malicious links. 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/wb?keyword=identifying%20phrases%20and%20clauses%20worksheet
    • http://files.donaldshoney.com/uploads/1/3/0/7/130775292/7315896.pdf
    • http://files.newtestamentchristianschool.com/uploads/1/3/0/7/130739809/13ab5ad4.pdf
    • http://files.stupindouscreations.com/uploads/1/3/1/3/131398351/sebovig.pdf
    • http://files.chefrayllc.com/uploads/1/3/1/4/131407823/7922823.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/gakarabunile.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/crack_abbyy_transformer_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/emerald_tablets_translation.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7844/files/tepajonozujujoxuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/xelewefuguwowowupagab.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/53369760936.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/greenberg_classification_of_african_languages.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/81478104160.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/jaxizesavoworodirovixofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/zagunazirivuxitaxebokiki.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/faradelirufodeladasovop.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/s/files/1/0429/6481/1927/files/jaxizesavoworodirovix

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005403.bin
70712f1a7d7f7ae2288483f6d7936dd10c51725fbbf5c3ae9bf88b42417a2c77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5403 5612 bytes
font_01_sfnt_off00006726.bin
08e4987180bdb3b89894d9af88a5bb7083aaf9a8ad5fa9fdfbc709d31e8b350d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 9748 bytes