Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5dc98b3d389bd5…

MALICIOUS

PDF

63.5 KB Created: 2020-08-14 17:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cd5762a7d6ffc2995f6e71986463716 SHA-1: a304af9feeea2f0da4d89e27c3ef631c2f81c47f SHA-256: 5b5dc98b3d389bd50ea6841ad43a9f4074472ed3285af021947b3dd4a966632a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be part of a link farm designed to distribute malicious content. 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=eevee+evolution+guide+pokemon+moon
    • http://files.drfaridyounos.com/uploads/1/3/0/7/130739598/saxesiwumo_xuleturikofafa_gurudam_ronefozitumu.pdf
    • http://files.scullyspark.com/uploads/1/3/1/6/131636655/4469979.pdf
    • http://files.janine-kitzen.com/uploads/1/3/0/8/130814172/gulufox_zazuk_faxafifa_jenetukazepama.pdf
    • http://files.himalclinic.com/uploads/1/3/0/7/130739288/tutugaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/6527/7605/files/2964203866.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/91577012624.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/lixufexedal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/bank_logins_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/96860702929.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/requests_vs_urllib2.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/textile_costing_formula.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/autoformation_windev_17.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009081.bin
44e871883ad4d93732fbd0c2502459b784dc08e4d903031132b092e63ce36614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9081 3808 bytes
font_01_sfnt_off00009e3a.bin
9a012cce435d9ddbdba7ab0da5d9af99c46a6b96a0006b6be7e12cc36f9e463e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3A 4876 bytes
font_02_sfnt_off0000aec5.bin
b31b96f82262bd593eb310e1189d3a97ffba1e358d15254ef10d4ddb3d7c909f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC5 6228 bytes
font_03_sfnt_off0000bf1a.bin
a62b3ddc5d589021fe960ffde3273b509908a995a2082c40aad2c26443dcf976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 10620 bytes
font_04_sfnt_off0000e39e.bin
65f64241a1c3d87421687d6e3ae42230a47670559d40fa78fde665565d0899cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 2748 bytes

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