Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db7afb1bb8ac828…

MALICIOUS

PDF

56.9 KB Created: 2020-08-10 00:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c604d4e38fb49976597f61f49ceb502e SHA-1: d8cc213bcb6e64f17461de787bedccdfcc78f90e SHA-256: 9db7afb1bb8ac82858deb6c5090d98d02390240a895f1c1eb2506c70e0a28678
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link, 'https://ttraff.com/pify?keyword=questions+on+algebraic+expressions+for+class+7+pdf', is identified as a malicious redirector. The document body, though heavily corrupted, appears to contain the same URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=questions+on+algebraic+expressions+for+class+7+pdf
    • http://files.public-school-library.com/uploads/1/3/1/4/131452867/gomavudozamet-burosibafiguv-nivuripuz-venuwutelawa.pdf
    • http://files.new-condo-launch.com/uploads/1/3/2/7/132710678/vimivapovaf-lapelade.pdf
    • http://files.natashagraddick.com/uploads/1/3/2/7/132740462/favulodupi_bifenimapowe_rimesikimoz_supunujuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8590/5576/files/kupesutowefatebe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/40821469294.pdf
    • https://cdn.shopify.com/s/files/1/0430/8097/4490/files/blessed_assurance_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/femumorowiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/pepazezubik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/uric_acid_test_kit.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/patuvawemanasum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/37078457716.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9847/files/divipev.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/rivopisadiwabipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/bifiwemugikikisosufakofak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080c4.bin
ec018b00394c039fd78fbd99a8ea0bdc0127bccc7593c32427a91bf7b69b6884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C4 5672 bytes
font_01_sfnt_off00009426.bin
e9017df26ce6470224a57a9f81e6ccba261ed2aba8536f7923163d95a4544682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9426 14448 bytes
font_02_sfnt_off0000c12d.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 16164 bytes

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