Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07040d300a9e719…

MALICIOUS

PDF

40.0 KB Created: 2020-08-25 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ddfe06cff20136927aa76f6104d5468 SHA-1: 0dd5db4eb99f899084b84ea4e351fb47d6b5820f SHA-256: b07040d300a9e71971d3d5d6befc8c8a8dc3f5386e3d6190ce68601d63459e86
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and the PDF structure reveals a large number of embedded links, many of which point to external resources. These factors suggest the primary purpose is to lure users to malicious sites.

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=ucheshi+katuni+video+s
    • http://bomukafux.newkirkbc.org/uploads/1/3/1/4/131438641/9ee7a39c5.pdf
    • http://veziguk.heartwoodpath.com/uploads/1/3/0/8/130814297/zumekuvebefe.pdf
    • http://files.babymyo.com/uploads/1/3/2/7/132710743/vevezelab-vazejo-fifodokaj.pdf
    • http://getosa.wekeepyoumotivated.com/uploads/1/3/0/7/130739287/6037708.pdf
    • http://files.paigetheyogi.com/uploads/1/3/1/4/131409526/2e9d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/breadth_first_traversal_c.pdf
    • https://cdn.shopify.com/s/files/1/0436/6794/7673/files/gubexozixenabinowabe.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/bourdon_tube_gauge.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/fishing_report_bull_shoals_lake_mo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9849/files/catalogo_de_bujias_ngk_2020_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0434/6026/4086/files/tejadonusuxuduwufur.pdf
    • https://cdn.shopify.com/s/files/1/0460/1656/1319/files/zofosadixoxos.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/wikudorejazaref.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/wabemotedugaratabexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/95627367960.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/31443976585.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/92077331197.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e84.bin
d566fb609f12fb1d3ed51ae38a5488b7e8508b9e2bb976db0b2163ef1c07cc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E84 5012 bytes
font_01_sfnt_off00006f8f.bin
49fdb05508e868f62c63ebf87779c1e81c8c875a72f857f492d611122a9c2c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 10400 bytes

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