Malicious PDF — malware analysis report

Static analysis result for SHA-256 829260581bb41fc3…

MALICIOUS

PDF

45.0 KB Created: 2020-08-04 21:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7808f9ee6b32aad5865880559da17b49 SHA-1: 015d57db089cb877a2142af2adf087f5a9f2ac6b SHA-256: 829260581bb41fc38912c5bf45669373a315cceeb6fc9ae1dce96af03b981a30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure like 'ttraff.com'. The document body and embedded links suggest a lure related to 'vbspu exam date 2020 pdf', likely intended to trick users into visiting malicious sites. The ML classifier strongly supports the malicious verdict.

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=vbspu+exam+date+2020+pdf
    • http://files.digitalcreditobservatory.org/uploads/1/3/1/6/131606465/kuzemoxuxif.pdf
    • http://files.joesettlesrealestate.com/uploads/1/3/1/4/131406082/tefum.pdf
    • http://files.forestfreshproducts.com/uploads/1/3/0/7/130739696/65d4289e.pdf
    • http://files.pittsborobaptist.com/uploads/1/3/0/7/130775846/8185341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/62469874967.pdf
    • https://cdn.shopify.com/s/files/1/0432/0221/6093/files/88636453694.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/50527604496.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/51565339507.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/80897777186.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/vubumegumalo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/kosejikigudawatiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/zajobanedewaviputojogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/denibixineketezodowujusox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/sigagiles.pdf
    • https://cdn.shopify.com/s/files/1/0430/6357/4682/files/convert_to_webm.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_off000063f4.bin
9299f1feff66df7e7dd76fda6f9f5c45591c45add16e06e9d38dc40ec2a6fe38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F4 5508 bytes
font_01_sfnt_off000076a2.bin
3e2464f451770c8c460efe7084308c6cdd3f388699aee2f0866a2a278f0fcdfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 10012 bytes
font_02_sfnt_off00009928.bin
6328c41acd9f931933e313102455530b63f9c8f67df1634c06d5f3da0c1f2b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9928 3580 bytes

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