Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1f937c0a627015…

MALICIOUS

PDF

38.7 KB Created: 2020-08-25 00:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a538657dfb6d6e7e3309d161a352ae9a SHA-1: eb6bd24efa4749f1c3eddb4ca7d27bef356b2049 SHA-256: af1f937c0a6270152be306e923407e6132262e5c51c5e81ecf4dfcd6967400de
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though obfuscated, contains the same redirector URL and references a video song, likely a lure to entice users to click. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=balam+pichkari+mare+video+song
    • http://files.catalystcw.com/uploads/1/3/1/8/131872087/2116975.pdf
    • http://kogite.gracepointlkn.com/uploads/1/3/0/8/130873951/mivopokevikami_tusepimupusar_tilonuwibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/malwarebytes_activation_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7317/files/nonlinear_autoregressive_neural_network.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/math_sheets_grade_1_printable.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/nubaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/anxiety_disorder_dsm_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/98401510092.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/susamoni.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/87979597318.pdf
    • https://cdn.shopify.com/s/files/1/0432/9527/7214/files/99530265259.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/56540400389.pdf
    • https://cdn.shopify.com/s/files/1/0463/3211/7147/files/former_churches_for_sale_scotland.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_off00004c48.bin
e0dc823767c7a47bc93a18e86a7e9876981e2d07f96e88c1e3288cafc69a89fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C48 5368 bytes
font_01_sfnt_off00005e56.bin
cca6d48fcc128efb996d0b9e6c9c2348efc9bd67755befec9c4f7f0823441677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E56 9848 bytes
font_02_sfnt_off00007fe5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 4324 bytes

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