Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c14b290977d854f…

MALICIOUS

PDF

39.3 KB Created: 2020-08-26 00:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 246d92f75d65af81eec9db2f90c6f258 SHA-1: 99a5983f48689ebebc9d25a232866d07a51d23fd SHA-256: 2c14b290977d854fc2229d779e6751b285b0289fa9f6931e0165cbbd82fbe8bb
154 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.com) or potentially malicious domains. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to educational materials, suggesting a lure to disguise the malicious links.

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.com/pify?keyword=prefixes+and+suffixes+worksheets+for
    • http://vadaxeja.bhaconstruction.com/uploads/1/3/0/9/130969204/gunesazuxoreb_pubajaju_rewizug.pdf
    • http://files.jewelleryshop.saltwaterstudios.co.uk/uploads/1/3/2/8/132814611/28d1f08ab0048.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/40069927194.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7665/files/61686620986.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/39071310882.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/93679726000.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/free_avery_template_8160.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/91396762068.pdf
    • https://cdn.shopify.com/s/files/1/0437/9253/1617/files/jacaranda_fm_playlist_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/63494764450.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedepisolutiri.pdf
    • https://cdn.shopify.com/s/files/1/0430/2215/5930/files/42949240913.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/xifejelerodibegajakex.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/xevomip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/autocad_electrical_tutorial_free_download.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_off00005a84.bin
3cd44cd868af280d66d5b5f85ba1149c6f9e3480a80fdfcfb0d58913a3a5eb5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 5188 bytes
font_01_sfnt_off00006c35.bin
175369be3c7a0f89f357d6e9cc3c61c722d459a8693531222f5a7cb160232a46
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C35 10668 bytes