Malicious PDF — malware analysis report

Static analysis result for SHA-256 98efb39017976e4d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 11:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb71df2b9a0aa706d1209185b9aeb51 SHA-1: d2d309cee9e904b3a8e3d21a2a61a66beb8c2cd5 SHA-256: 98efb39017976e4d55c31d2515817a0254987961187c85e273a253df61ccf7f9
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, leading to a redirector. The primary malicious link is https://ttraff.cc/pify?keyword=bathukamma+songs+lyrics+pdf, which is likely used to deliver a secondary payload. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link-based social engineering attack.

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.cc/pify?keyword=bathukamma+songs+lyrics+pdf
    • http://files.jeanducasse.com/uploads/1/3/0/7/130739398/rurepusig-kegimatijemupal.pdf
    • http://sidipo.parent-partner.com/uploads/1/3/2/3/132302978/7388367.pdf
    • http://tenid.watkinsdancecompany.com/uploads/1/3/1/4/131453645/vigito-marulesizedodi-kumajatul.pdf
    • http://gisemepa.russianspoon.com/uploads/1/3/2/7/132710712/kezoduwefalofini.pdf
    • http://files.katherinekeanfineart.com/uploads/1/3/2/6/132682051/9229343.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/babuzobif.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/zebagibobuvunixewoxilix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/87105870084.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/23941548752.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/12394072481.pdf
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/pixel_art_mario.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/89734017147.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/69420072520.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/59932190716.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/34234155301.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/61490013766.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/24100903785.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/gijoralujewizu.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_off000066d3.bin
f5cc7328fabbb14ca880dafed524f65a18d5e2fd2ac68b6f30d1aae48ba256bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D3 5784 bytes
font_01_sfnt_off00007a6a.bin
532dda60ef95ce96c0312721ba16abd0a6242ca306a914ededd4dadd272c57a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 2704 bytes
font_02_sfnt_off00008667.bin
a8863fd859c38e37ea6bbb2422f9614cba3eb1a3468fe6e0c6163f74648aa687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 9968 bytes

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