Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2b48839e77b78e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-04 14:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a663ffeb978f873b53af08eb855c40 SHA-1: 66e6759adeeb1b21c09a25e678582553fd462b40 SHA-256: 9d2b48839e77b78e2e6dbd7859d40e57e80199af68434154c9d46ccb305a7a59
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=awas+yojana+form+pdf'. Additionally, it exhibits a PDF link farm behavior, with numerous links to Shopify-hosted PDFs, one of which is 'https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf'. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains the URL and mentions 'awas yojana form pdf', suggesting a lure.

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.ru/pify?keyword=awas+yojana+form+pdf
    • http://files.kootenaicommunitycentre.org/uploads/1/3/1/3/131379828/mevemomalap_zelosalabafo.pdf
    • http://files.goodlyframe.org/uploads/1/3/1/4/131483148/1a2b5c.pdf
    • http://files.danielepiserchia.com/uploads/1/3/1/4/131483266/widakiti-pulolugaxo-tefok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/galovonad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/melutazem.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/introduction_to_public_health_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/busbar_differential_protection.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/openssl_encrypt_file.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/cambridge_primary_mathematics_curriculum_framework.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/71806940534.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/zipibofepemidijogexexeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/54466799265.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/gopamebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/bowipufumami.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_off00006a99.bin
4386847818938f0b293f55137340cbe587ffc583a1a0b194d69fafc3de06778c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 5416 bytes
font_01_sfnt_off00007d0b.bin
2aac2d74526b39203c78b022076367be43eaaea3ad10083be7f64d57863b1443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 10340 bytes
font_02_sfnt_off0000a0a1.bin
156192aa81c69495e92b6231bd5ce899a3dc0a77deb2452c2c7a367aebc54672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A1 5604 bytes

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