Malicious PDF — malware analysis report

Static analysis result for SHA-256 56457d2c519480d6…

MALICIOUS

PDF

40.2 KB Created: 2020-08-05 10:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc0ac9cbb3d70ac8bf08d11e7d185323 SHA-1: dba925994bd6bed3102b25a44e736d5d6decdb27 SHA-256: 56457d2c519480d6618db33323cb3a5adc14ae34c9c458861d51b9e20a1c53cc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious intent as an educational worksheet. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly suggests a phishing or redirection attack. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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=arithmetic+and+geometric+sequence+worksheet+pdf
    • http://files.drsamuelgbrooksguild.org/uploads/1/3/2/3/132302759/fesuxepa.pdf
    • http://pizoze.nafcog.org/uploads/1/3/2/7/132710797/3e6c7.pdf
    • http://files.maestromusiclessons.org/uploads/1/3/1/4/131438348/e0ee2d25dc.pdf
    • http://files.theinkwelltheatre.org/uploads/1/3/2/6/132695492/wofamusaragu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/1778516312.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/susotejawif.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/81226072250.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/dusidivas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/debeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/vonijafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/87247086022.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/bridgeport_milling_machine_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/19452289776.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/nevotepilevusema.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/vovotezefaxajoxelizur.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/10586242390.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/23099255513.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/1/0431/9064/8996/files/230992555

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efa.bin
749bb785387f631033a0bba34f30883a0591261fa85cd6e271b244065c43170d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 5808 bytes
font_01_sfnt_off000072a5.bin
01878280c55c03b69eb101946bf105e3997d0eae6220fb0f0f1635c182c22c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 9544 bytes

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