Malicious PDF — malware analysis report

Static analysis result for SHA-256 8749939f7a064e50…

MALICIOUS

PDF

82.5 KB Created: 2020-08-07 20:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ead06e46814f4077ea5b87c33950487 SHA-1: c97376318f7027bc965170dc4a8c64685fec1758 SHA-256: 8749939f7a064e50310a0de25ee47fc71f8f6949816b46e9db964f2e6aa146e2
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links, many pointing to potentially compromised or malicious domains, further supports the malicious intent. 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.com/pify?keyword=benumof+s+airway+management+free+pdf
    • http://files.christinenoell.com/uploads/1/3/2/7/132740852/lenutola_sural_luwapese_gogosuwilurevif.pdf
    • http://files.truplans.net/uploads/1/3/1/3/131384660/2305946.pdf
    • http://files.downtheroadfarm.com/uploads/1/3/2/6/132682282/gefojepatoxud_rudatopedabupaf_nuzekap.pdf
    • http://files.usbby.org/uploads/1/3/0/7/130738845/jonujesilu-begawiza-rixajuvira.pdf
    • https://cdn.shopify.com/s/files/1/0435/6718/6079/files/bhagavad_gita_in_english_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/4257/8332/files/whistleblower_complaint_searchable.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/joni_mitchell_for_the_roses.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/cantabile_paganini.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/fupenatobesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/waxemavutax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/rudram_chamakam_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/jinuvetoraninizedadiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2062/9654/files/antidiabetic_activity.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4623/1449/files/1993_aashto_flexible_pavement_structural_design.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/77389359698.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/japixegitirud.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/1/0433/1244/7652/fil

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99f.bin
12a53cf542756a636505c008f64f92a0e76cae0d090c7c61a8dc4428460bc7d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5572 bytes
font_01_sfnt_off0000fc99.bin
72ddac4f9ebf02dce1a7ce8fda305bbfc25942e55d86969beb3ba164e7b97ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 12640 bytes
font_02_sfnt_off000126ea.bin
5758e35533dcaaa7d769e694966f6dda0aa0009c5f558295172dbf8874c8f45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16184 bytes

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